Dogs cannot tell us when they feel sick, so recognizing the subtle signs of illness is a critical skill for every dog owner. Many common canine illnesses are highly treatable when caught early, but can become serious or even fatal if ignored. This guide covers the most frequent health problems seen in veterinary clinics and the warning signs you should never ignore.
Ear Infections (Otitis Externa)
Ear infections are the single most common reason dogs visit the vet. Floppy-eared breeds (Cocker Spaniels, Basset Hounds, Golden Retrievers) and dogs with allergies are at highest risk. Signs include head shaking, scratching at ears, redness, foul odor, and dark discharge. Ear infections are painful and will not resolve without treatment — typically medicated ear drops and cleaning. Left untreated, chronic infections can lead to permanent hearing loss and require surgery.
Kennel Cough (Canine Infectious Tracheobronchitis)
Kennel cough is a highly contagious respiratory infection comparable to the common cold in humans. The hallmark symptom is a persistent, dry, honking cough that sounds like something is stuck in the dog's throat. It spreads rapidly in places where dogs congregate: boarding facilities, dog parks, grooming salons, and shelters. Most cases resolve on their own within 1-3 weeks, but puppies, seniors, and immunocompromised dogs may develop pneumonia. The Bordetella vaccine provides protection against the most common strain.
Pancreatitis
Pancreatitis is inflammation of the pancreas that can range from mild discomfort to life-threatening organ failure. Miniature Schnauzers, Yorkshire Terriers, and Cocker Spaniels have genetic predispositions. A high-fat meal (like table scraps or getting into the trash) is the most common trigger. Classic signs include vomiting, hunched posture, praying position (front end down, rear up), abdominal pain, and lethargy. Treatment requires hospitalization with IV fluids, pain management, and fasting.
Dental Disease (Periodontal Disease)
By age 3, over 80% of dogs have some degree of dental disease, making it the most common preventable health problem in dogs. It begins with plaque buildup that hardens into tartar, leading to gingivitis (red, swollen gums) and eventually periodontitis where the supporting structures of teeth are destroyed. Signs include bad breath, yellow-brown teeth, bleeding gums, difficulty eating, and tooth loss. The bacteria from dental disease can enter the bloodstream and damage the heart, liver, and kidneys. Daily brushing and professional cleanings prevent this condition.
When to See a Vet Immediately
While some symptoms can be monitored at home, certain signs require emergency veterinary attention: difficulty breathing or choking, collapse or inability to stand, severe bleeding that does not stop within 5 minutes, suspected poisoning or toxin ingestion, bloated or distended abdomen with unproductive retching (possible GDV/bloat), inability to urinate (especially in male dogs), seizures lasting more than 5 minutes, and any sudden behavior change accompanied by other symptoms. When in doubt, always call your veterinarian.
Expert Tips
- Perform weekly at-home health checks: examine ears, eyes, mouth, skin, and paws
- Know your dog's normal resting respiratory rate (10-35 breaths per minute)
- Keep a pet first aid kit with gauze, antiseptic wipes, tweezers, and your vet's number
- Never give human medications without veterinary approval — many are toxic to dogs
- Schedule annual wellness exams including blood work for early disease detection
- Learn your dog's normal behavior — subtle changes are often the first sign of illness