Your dog can’t tell you when something’s wrong. That’s why knowing how to read the signs — and understanding which ones require immediate action — is one of the most valuable skills a dog owner can develop. This guide walks you through the most common dog health symptoms, what they typically mean, and when to pick up the phone and call your vet.
We’ll cover everything from taking your dog’s basic vital signs to recognizing emergencies that can’t wait. Think of this as your reference guide for those moments when you’re not sure if that limping or that cough is something to worry about.
Know Your Dog’s Normal: Taking Baseline Vitals
Before you can recognize abnormal, you need to know what’s normal for your dog. Spend a few minutes learning to check these basics — it’s a skill that could save your dog’s life in an emergency.
How to Check Your Dog’s Vitals
| Vital Sign | Normal Range | How to Check |
|---|---|---|
| Heart rate (resting) | 60-140 bpm (smaller dogs higher) | Place hand on left chest behind front leg; count beats for 15 seconds, multiply by 4 |
| Respiratory rate | 15-30 breaths/min (resting) | Count chest rises for 30 seconds, multiply by 2. Dog must be at rest. |
| Temperature | 100.5–102.5°F (38.1–39.2°C) | Rectal thermometer; lubricate tip and insert 1 inch. Hold for 60 seconds. |
| Gum color | Bubble-gum pink, moist | Lift lip and look at gums above upper teeth |
| Capillary refill time | Less than 2 seconds | Press gum firmly with finger, release — color should return in under 2 seconds |
| Hydration | Skin snaps back immediately | Pinch skin at back of neck, release — should return to normal instantly |
Practice checking these when your dog is healthy. That way you’ll notice the difference quickly if something changes.
Digestive Symptoms
Vomiting
Dogs vomit more readily than humans — it doesn’t always indicate a serious problem. Here’s how to read it:
| Situation | Likely Cause | Action |
|---|---|---|
| Single vomit, dog acts normal, no blood | Eating too fast, minor irritation | Monitor; withhold food for 2 hours; offer water |
| Vomiting 2+ times in a few hours, dog seems off | Dietary indiscretion, mild illness | Call vet if doesn’t improve by next morning |
| Blood in vomit (red or coffee-ground appearance) | Ulcer, serious GI issue, toxin | 🚨 Vet immediately |
| Vomiting + bloated abdomen + unsuccessful retching | GDV (Bloat) — life-threatening | 🚨 Emergency vet NOW |
| Vomiting + other symptoms (lethargy, pain, neurological signs) | Toxin ingestion, systemic illness | 🚨 Vet immediately |
Diarrhea
Like vomiting, occasional diarrhea isn’t always serious. The key factors: duration, severity, and accompanying symptoms.
- Single loose stool, dog acting normally: Often dietary; monitor and ensure access to water
- Diarrhea for more than 24-48 hours: Call your vet
- Blood in stool (bright red or black/tarry): Black tarry stool (melena) especially indicates upper GI bleeding — vet immediately
- Diarrhea + vomiting together: Risk of rapid dehydration, especially in puppies — vet same day
- Puppy with diarrhea: Take more seriously than adults — puppies dehydrate quickly and parvovirus is a real risk in unvaccinated dogs
Dehydration risk is especially high in puppies, seniors, and small breeds. If your dog won’t drink water alongside diarrhea, they need veterinary fluids.
Changes in Appetite
Decreased appetite: Missing one meal occasionally isn’t concerning. Refusing food for more than 24 hours in an adult dog, or 12 hours in a puppy, warrants a call to your vet.
Increased appetite with weight loss: This combination (eating more but losing weight) is a classic sign of conditions like diabetes, hyperthyroidism (rare in dogs), intestinal parasites, or Cushing’s disease.
Sudden food obsession in a dog that was never food-driven: Can indicate thyroid issues, Cushing’s disease, or medication side effects (especially steroids).
Respiratory Symptoms
Coughing
| Type of Cough | Possible Cause | Urgency |
|---|---|---|
| Occasional cough after drinking water | Minor irritation or tracheal sensitivity | Monitor |
| Honking/goose-honk cough | Tracheal collapse (common in small breeds) | Vet appointment |
| Productive cough with discharge | Kennel cough (bordetella), pneumonia | Vet appointment (same day if discharge is yellow/green) |
| Coughing + blue-tinged gums | Severe respiratory distress or cardiac issue | 🚨 Emergency vet NOW |
| Coughing at night or after exercise | Heart disease, fluid in lungs | Vet appointment soon |
Labored or Rapid Breathing
Normal panting is a cooling mechanism — this is fine after exercise or in heat. Concerning breathing:
- Labored breathing at rest with visible rib/abdominal effort
- Open-mouth breathing in cats (always an emergency), or in dogs at rest
- Blue or purple gum color
- Stretching neck out to breathe
- Breathing rapidly while sleeping
Any of these warrant emergency veterinary care.
Musculoskeletal Symptoms
Limping and Lameness
| Presentation | Common Causes | Action |
|---|---|---|
| Sudden severe lameness (won’t bear weight) | Fracture, torn ligament, joint injury | 🚨 Same-day vet |
| Mild limp after exercise, improves with rest | Overexertion, minor sprain | Rest; monitor 24-48 hours; vet if no improvement |
| Gradual worsening limp over weeks | Arthritis, hip dysplasia, bone disease | Vet appointment |
| Limp with visible swelling, warmth, or wound | Infection, abscess, bite wound | Vet appointment (same day) |
| Sudden hind limb weakness or paralysis | Spinal injury, disc disease (IVDD) | 🚨 Emergency vet NOW |
Stiffness and Difficulty Moving
Stiffness after rest that improves with movement is a classic sign of arthritis. This is extremely common in senior dogs — estimated to affect 80% of dogs over 8 years old. Management options include weight control, low-impact exercise, joint supplements, and veterinary pain management (NSAIDs prescribed by a vet — never give human pain relievers to dogs).
Skin and Coat Symptoms
Itching and Scratching
Persistent scratching, licking paws, rubbing face, or recurring ear infections are often signs of:
- Environmental allergies (grass, dust mites, mold)
- Food allergies (most commonly beef, dairy, chicken, wheat)
- Flea allergy dermatitis (reaction to flea saliva — even one flea bite can cause weeks of itching)
- Contact allergies (certain surfaces, cleaning products)
For a complete breakdown of itch causes and treatments, read our detailed guide to dog itching and scratching. If your dog is itching chronically, it’s worth a vet visit — most dogs need some diagnostic work to identify the root cause.
Hair Loss (Alopecia)
Patches of hair loss can indicate:
- Ringworm (fungal infection — contagious to humans)
- Mange (sarcoptic or demodectic mites)
- Hormonal conditions (hypothyroidism, Cushing’s)
- Allergies leading to self-trauma
Lumps and Bumps
Not every lump is cancer — fatty tumors (lipomas) are common in middle-aged and senior dogs and are often benign. However, all new lumps should be evaluated by a vet. Key warning signs:
- Growing rapidly
- Irregular border or attached to underlying tissue
- Ulcerating or bleeding
- Located in the mouth, lymph nodes, or mammary glands
The only way to know for certain is a fine needle aspirate or biopsy.
Neurological Symptoms
Seizures
A seizure is a frightening experience. Key points:
- Do NOT put your hand near the dog’s mouth — they are unconscious and can bite involuntarily
- Move furniture away to prevent injury
- Keep the environment quiet and dark
- Time the seizure — if it lasts more than 5 minutes (status epilepticus), go to emergency vet immediately
- First isolated seizure: contact your vet same day
- Multiple seizures in 24 hours: emergency vet
Disorientation and Head Tilt
Sudden head tilt, circling, loss of balance, and rapid eye movements (nystagmus) together are classic signs of vestibular disease — often called “old dog vestibular syndrome.” While alarming in appearance, idiopathic vestibular disease often resolves on its own in 1-3 weeks. However, stroke and brain tumors present similarly, so a vet visit is essential to determine the cause.
Urinary Symptoms
Changes in Urination
| Symptom | Possible Cause | Action |
|---|---|---|
| Straining or crying while urinating | UTI, bladder stones, obstruction | 🚨 Vet same day |
| Blood in urine | UTI, bladder stones, cancer | Vet same day |
| Dramatically increased urination + thirst | Diabetes, kidney disease, Cushing’s | Vet appointment soon |
| Leaking urine while sleeping | Urinary incontinence (common in spayed females) | Vet appointment |
| House-trained dog having accidents | UTI, hormonal, age-related, anxiety | Vet appointment |
Eye and Ear Symptoms
Eye Issues
The eyes are sensitive and infections can progress quickly. See a vet within 24 hours for:
- Yellow or green eye discharge
- Squinting or keeping eye closed
- Visible cloudiness over the eye
- Eye protruding or appearing sunken
- Visible third eyelid (“cherry eye”)
Ear Issues
Healthy ears are pale pink with minimal odor and no discharge. See a vet for:
- Dark brown or black discharge (often yeast)
- Strong, musty, or foul odor
- Constant head shaking or scratching at ears
- Swollen or painful ear canal
- Redness or swelling of the ear flap
Recurring ear infections are often allergy-related. Treating the allergy resolves the ear problems long-term.
Emergency Symptoms: Go to the Vet Immediately
These symptoms cannot wait — they require same-day or emergency veterinary care:
| Symptom | Possible Emergency |
|---|---|
| Distended abdomen + retching without vomiting | GDV (Bloat) — life-threatening in hours |
| Pale, white, blue, or gray gums | Shock, internal bleeding, heart failure |
| Collapse or inability to stand | Heart event, poisoning, severe anemia, trauma |
| Difficulty breathing at rest | Cardiac or respiratory failure |
| Suspected toxin ingestion | Poisoning — do not wait for symptoms |
| Seizures lasting 5+ minutes or multiple seizures | Status epilepticus |
| Eye injury or sudden blindness | Retinal detachment, corneal laceration |
| Trauma (hit by car, fall from height, animal attack) | Internal injuries may not be visible |
| Sudden hind limb paralysis | Spinal cord injury or disc herniation |
Emergency contacts to have saved:
- Your regular vet’s phone number
- Nearest 24-hour emergency animal hospital
- ASPCA Animal Poison Control: (888) 426-4435
Preventive Care: Your Best Defense
Most serious health problems become more manageable — or are entirely preventable — with consistent preventive care. The foundation:
Annual Wellness Exams
Even a dog that seems perfectly healthy should see the vet annually. Vets can detect:
- Heart murmurs before they become symptomatic
- Dental disease before it requires expensive extraction
- Lumps that are more easily treated when small
- Subtle weight changes that indicate metabolic issues
Vaccinations
Core vaccines protect against serious, preventable diseases. Keep your dog’s vaccinations current throughout their life. For a complete schedule, see our dog vaccination schedule guide.
Parasite Prevention
Year-round parasite prevention covers:
- Heartworm — transmitted by mosquitoes; treatment is expensive and harsh; prevention is cheap and easy
- Fleas — cause skin issues, transmit tapeworms, and infest your home
- Ticks — transmit Lyme disease, anaplasmosis, and other serious illnesses
- Intestinal parasites — annual fecal testing plus deworming as needed
Dental Care
Dental disease affects 80%+ of dogs by age 3. Daily brushing with dog-specific toothpaste is ideal, but even 2-3 times per week makes a significant difference. Combined with annual or biannual professional cleanings, you can prevent the pain, tooth loss, and systemic inflammation that come with advanced dental disease.
Weight Management
Obesity shortens a dog’s life by 2+ years and dramatically increases the risk of arthritis, diabetes, heart disease, and joint problems. If you can’t easily feel your dog’s ribs or see a waist from above, they need a diet adjustment. Our dog feeding guide can help you calibrate portions correctly.
When to Trust Your Gut
You know your dog better than anyone. If something feels wrong — if your dog is “just not themselves” even without obvious symptoms — that instinct is worth acting on. A same-day call to your vet describing what you’re seeing is always appropriate when you’re concerned.
The worst that happens: the vet says it’s nothing to worry about. The best that happens: you catch something early when it’s most treatable. When it comes to your dog’s health, early is always better.
For more in-depth information on specific health topics, explore our full library — including our guide to dog itching and scratching and our complete dog vaccination schedule.
Age-Related Health Changes: What to Expect as Your Dog Gets Older
Dogs age faster than humans, and many health changes happen gradually enough that owners don’t notice until the condition has progressed. Here’s a decade-by-decade guide to what’s normal and what to watch for:
Young Adult Dogs (1-3 years)
- Generally peak health — this is the baseline you want to protect
- Dental disease starts building; establish brushing habits now
- Risk of orthopedic injuries from high activity; watch for limping after exercise
- Annual wellness exams to establish baseline bloodwork values
Middle-Aged Dogs (4-7 years)
- Subtle weight gain becomes common — adjust calories before it becomes a problem
- Dental cleanings often become necessary
- Lumps and bumps start appearing; most are benign lipomas, but all should be evaluated
- Early signs of joint stiffness in larger breeds — consider joint supplements proactively
Senior Dogs (7+ years, earlier for giant breeds)
- Biannual vet visits become important — twice-yearly bloodwork can catch kidney disease, thyroid issues, and diabetes in early stages
- Arthritis is nearly universal; pain management significantly improves quality of life
- Cognitive dysfunction syndrome (similar to dementia) affects many senior dogs — symptoms include confusion, changed sleep patterns, house-soiling, and decreased interaction
- Increased risk of cancer — any new lump or unexplained weight loss should be evaluated promptly
- Dental disease becomes a significant quality-of-life issue
Breed-Specific Health Concerns
Certain breeds are genetically predisposed to specific health issues. Knowing your dog’s breed risks helps you watch for early signs:
| Breed Group | Common Health Issues | Watch For |
|---|---|---|
| Large/Giant breeds (Labs, Goldens, Great Danes) | Hip/elbow dysplasia, GDV (bloat), bone cancer | Limping, reluctance to move, distended abdomen |
| Brachycephalic (Bulldogs, Pugs, French Bulldogs) | BOAS (breathing syndrome), eye issues, spinal problems | Noisy breathing, exercise intolerance, eye discharge |
| Small breeds (Chihuahuas, Maltese, Yorkies) | Dental disease, patellar luxation, tracheal collapse | Skipping gait, honking cough, bad teeth |
| Herding breeds (Border Collie, Aussie) | MDR1 gene mutation (drug sensitivity), eye problems, epilepsy | Adverse drug reactions, vision changes |
| Dachshunds | IVDD (intervertebral disc disease) | Back pain, hind limb weakness, paralysis |
| Cavalier King Charles Spaniels | Mitral valve disease, syringomyelia | Heart murmur, neck scratching, pain |
If you have a purebred dog, ask your vet about breed-specific screening tests at your first appointment. Many conditions can be detected before symptoms appear, allowing for earlier and more effective management.
Understanding Your Dog’s Pain Levels
Dogs instinctively hide pain — it’s a survival mechanism from their wolf ancestors. This means your dog can be in significant discomfort without obvious signs. The Colorado State University Veterinary Pain Scale offers a useful framework:
- 0 – No pain: Alert, comfortable, normal movement and posture
- 1-2 – Mild pain: Slightly withdrawn, occasional whimpering, may favor a limb
- 3-4 – Moderate pain: Reluctance to move, decreased appetite, protective of painful area, may vocalize when area is touched
- 5-6 – Moderate-severe: Abnormal posture (hunched), persistent vocalizing, significant behavior changes
- 7-8 – Severe: Crying, inability to get comfortable, aggressive when approached or touched
- 9-10 – Excruciating: Continuous crying, unable to stand, non-responsive
Chronic pain often presents more subtly: a dog that used to love fetch but now loses interest, a dog that’s become grumpy about being touched, or a dog that sleeps more than usual may all be experiencing pain that warrants investigation. Never give human pain medications (ibuprofen, acetaminophen, naproxen) to dogs — they are toxic at any dose.
Home First Aid Basics for Dog Owners
Having a pet first aid kit and knowing basic techniques can stabilize your dog until you reach veterinary care:
First Aid Kit Contents
- Digital rectal thermometer + lubricant
- Gauze pads and self-adhesive bandage wrap (Vetrap)
- Saline wound wash
- Hydrogen peroxide (only to induce vomiting if directed by vet — not for wound cleaning)
- Sterile eye wash
- Tick removal tool
- Blunt-ended scissors and tweezers
- Styptic powder (for broken nails)
- Muzzle (even the gentlest dog may bite when in pain)
- Your vet’s number, emergency vet number, and ASPCA Poison Control number
Basic First Aid Techniques
Wound care: Apply direct pressure to stop bleeding. Once controlled, flush wound gently with saline. Do not apply ointments or human antiseptics — then get to a vet, as most wounds in dogs need professional cleaning and may require antibiotics.
Choking: If your dog is pawing at their mouth and making choking sounds, look inside carefully. If you can see the object and safely remove it, do so. If not, modified Heimlich for dogs: with dog standing, make a fist below the ribcage and apply sharp upward thrust. Get to a vet immediately after.
Burns: Cool with cool (not cold) water for 10 minutes. Don’t apply ice, butter, or any ointment. Cover loosely with damp gauze. Emergency vet immediately.
Heatstroke: Move to cool area, apply cool (not cold) wet towels to armpits, groin, and back of neck. Offer water if conscious. Heatstroke is a veterinary emergency — do not wait to see if they recover.