Dogs cannot tell us when they feel unwell, so owners must learn to recognize subtle signs that indicate a trip to the veterinarian is needed. Changes in appetite, energy level, behavior, and physical appearance often signal health problems that are easier and less expensive to treat when caught early. This guide teaches you exactly what to watch for and when to seek emergency care.

Changes in Eating Habits

A sudden loss of appetite lasting more than twenty-four hours warrants a veterinary call. While dogs occasionally skip a meal without cause, prolonged refusal to eat can indicate pain, nausea, dental disease, infection, or organ dysfunction. Note whether your dog approaches the bowl and turns away, or if they seem interested but unable to eat—these details help your vet narrow the diagnosis.

Excessive thirst is another important red flag. Drinking significantly more water than usual (polydipsia) can signal kidney disease, diabetes, Cushing's disease, or poisoning. Monitor your dog's water intake by tracking how often you refill their bowl. An increase from the normal one ounce per pound of body weight daily to double that amount is clinically significant.

Sudden changes in eating habits in the opposite direction—eating ravenously without weight gain—can also indicate illness. Increased appetite combined with weight loss and excessive thirst is a classic presentation of diabetes. Increased appetite with weight gain and a pot-bellied appearance may indicate Cushing's disease. Any unexplained change in appetite lasting more than two days should be evaluated by your veterinarian.

Behavioral Changes

A previously social dog who becomes withdrawn, hides, or avoids interaction may be in pain or feeling unwell. Dogs who suddenly become clingy or refuse to leave your side may be experiencing anxiety related to physical discomfort. Changes in temperament—a normally friendly dog who becomes irritable or aggressive—often indicate underlying pain that needs medical attention.

Unexplained lethargy is one of the most common signs of illness. If your normally active dog is unwilling to walk, play, or engage in activities they usually enjoy, something is wrong. Lethargy combined with other symptoms like coughing, vomiting, or diarrhea suggests a systemic illness that requires prompt veterinary evaluation. Even mild lethargy lasting more than a day or two deserves attention.

Changes in sleeping patterns, excessive vocalization, restlessness, or pacing can indicate pain, cognitive decline in senior dogs, or anxiety related to illness. Dogs who suddenly begin panting at rest, especially when combined with restlessness, may be experiencing pain or respiratory distress. Note these behaviors and share the timeline with your veterinarian.

Physical Symptoms

Check your dog's gums regularly. Healthy gums are pink and moist, returning to pink within two seconds when pressed (capillary refill time). Pale, white, yellow, or blue-tinged gums indicate serious health problems including anemia, internal bleeding, liver disease, or oxygen deprivation. Bright red gums may indicate heatstroke, poisoning, or severe infection.

Lumps and bumps are common in dogs, and most are benign fatty tumors (lipomas). However, any new lump that grows rapidly, changes shape, bleeds, or appears in an unusual location should be examined by a veterinarian. Early detection of malignant tumors significantly improves treatment outcomes. Check your dog's body monthly by running your hands over their entire body during grooming or petting.

Eye changes require prompt attention. Cloudiness, redness, discharge, squinting, or visible third eyelid can indicate infection, glaucoma, corneal ulcers, or systemic illness. Eye problems can deteriorate rapidly and cause permanent damage if not treated quickly. If your dog is pawing at their eye, holding it closed, or showing any visible abnormality, schedule a veterinary appointment immediately.

Digestive Issues

Occasional vomiting or diarrhea is normal for dogs and usually resolves within twenty-four hours without treatment. However, repeated vomiting (more than two to three times in a day), diarrhea lasting more than forty-eight hours, or the presence of blood in vomit or stool requires veterinary attention. Blood that looks like coffee grounds in vomit indicates bleeding in the upper digestive tract and is an emergency.

Straining to defecate, producing only small amounts, or complete inability to pass stool can indicate constipation, blockage, or anal gland problems. A dog who is straining, whining, or circling repeatedly while attempting to defecate needs veterinary care. Similarly, straining to urinate, particularly in male dogs, may indicate a urinary blockage—a life-threatening emergency that requires immediate treatment.

Abdominal bloating, especially in large, deep-chested breeds, is a medical emergency. If your dog's abdomen appears distended, they are retching without producing vomit, and they seem restless or in pain, this may indicate gastric dilatation-volvulus (bloat), where the stomach twists on itself. This condition requires immediate emergency surgery and can be fatal within hours.

Skin and Coat Problems

A dull, dry, or flaky coat can indicate nutritional deficiencies, allergies, thyroid problems, or parasitic infections. Healthy coats are shiny, smooth, and free of excessive dandruff. Sudden changes in coat quality, especially when combined with hair loss, redness, or scratching, warrant a veterinary examination to identify the underlying cause.

Excessive scratching, licking, or chewing at specific areas can indicate allergies, fleas, mites, or skin infections. Hot spots—areas of inflamed, infected skin that appear suddenly—are painful and can spread rapidly. Clean the area gently and keep your dog from licking it while waiting for veterinary care. Chronic skin issues benefit from allergy testing and targeted treatment plans.

Fleas and ticks are external parasites that cause discomfort and transmit serious diseases. Check your dog for fleas (tiny dark specks moving in the coat or flea dirt resembling ground pepper) and ticks (embedded oval shapes, often found in ears, armpits, and groin area) regularly. If you find ticks, remove them carefully with tweezers and save them for identification. Monitor your dog for symptoms of tick-borne diseases including fever, lethargy, and joint swelling.

When It's an Emergency

Some situations require immediate emergency veterinary care. Seizures lasting more than three minutes, multiple seizures in twenty-four hours, or a first-time seizure in an adult dog are emergencies. During a seizure, clear the area around your dog to prevent injury, time the seizure, and do not put your hands near their mouth. After the seizure, keep your dog calm and transport them to the vet immediately.

Trauma from being hit by a car, falling from a height, or being attacked by another animal requires emergency evaluation even if your dog appears unhurt. Internal bleeding, organ damage, and shock may not be immediately apparent. Keep your dog warm, minimize movement if a spinal injury is suspected, and transport them to an emergency veterinary clinic.

Difficulty breathing—characterized by rapid, labored breathing, blue-tinged gums, or choking—is a life-threatening emergency. Causes include choking on an object, allergic reaction, heart failure, or respiratory infection. If your dog is choking, carefully look in their mouth for an object you can safely remove. If you cannot identify or remove the cause, transport them to emergency care immediately.

Preventive Checkups

Annual wellness examinations catch health problems before symptoms appear. Your veterinarian performs a physical exam, runs blood work, checks dental health, updates vaccinations, and discusses diet and lifestyle. Senior dogs (over seven years for large breeds, over ten for small breeds) benefit from biannual checkups, as health conditions develop more rapidly in aging dogs.

Preventive care includes year-round parasite prevention for fleas, ticks, heartworm, and intestinal parasites. Your veterinarian recommends products based on your dog's lifestyle and risk factors. Dental cleanings under anesthesia remove tartar buildup that home brushing cannot address and allow for dental X-rays that detect hidden problems below the gumline.

Maintain a health record for your dog including vaccination dates, medications, test results, and any health concerns you have noticed. This information helps your veterinarian identify patterns and make informed decisions about your dog's care. Digital health records or a dedicated notebook make it easy to share accurate information during veterinary visits.

Preparing for the Vet Visit

Prepare for veterinary visits by bringing a written list of symptoms, changes in behavior, and questions you want to ask. Note when symptoms started, how often they occur, and whether they are getting worse, improving, or staying the same. This timeline helps your veterinarian narrow the diagnosis and determine the urgency of your dog's condition.

Bring a fresh stool sample if your dog has digestive symptoms. Collect the sample in a sealed container and refrigerate it until your appointment. For urinary symptoms, bring a urine sample if possible. These samples allow your veterinarian to run diagnostic tests during the visit rather than scheduling a separate appointment.

Keep your dog calm and secure during transport. Use a well-fitted crate or harness restraint in the car. Bring high-value treats to reward calm behavior at the clinic. If your dog is anxious at the vet, discuss anti-anxiety strategies with your veterinarian before the visit. Some dogs benefit from calming supplements, pheromone sprays, or mild sedation for stressful appointments.

Frequently Asked Questions

Signs of pain in dogs include whimpering, guarding a body part, reluctance to move, changes in appetite, excessive licking of a specific area, flattened ears, tense facial expression, and aggression when touched. Dogs naturally hide pain, so subtle changes in behavior often indicate discomfort. If you suspect your dog is in pain, schedule a veterinary appointment for evaluation and pain management.
Go to the emergency vet immediately for difficulty breathing, seizures, inability to urinate, suspected bloat (distended abdomen with unproductive retching), severe bleeding, trauma, collapse, or sudden inability to walk. Also seek emergency care for repeated vomiting with blood, extreme lethargy, and eye injuries. When in doubt, call the emergency clinic to describe symptoms before arriving.
Adult dogs need annual wellness examinations, while senior dogs over seven years benefit from biannual visits. Puppies require visits every three to four weeks until sixteen weeks of age for vaccinations. Any time your dog shows signs of illness, injury, or behavioral change, schedule a veterinary appointment promptly. Preventive care is more affordable and effective than treating advanced disease.
Eating grass is common and usually harmless. Dogs may eat grass out of boredom, to add fiber to their diet, or because they enjoy the taste. However, excessive grass eating accompanied by vomiting, diarrhea, or loss of appetite may indicate gastrointestinal upset that needs veterinary attention. Ensure the grass has not been treated with pesticides or fertilizers before allowing your dog to graze.
Warning signs include unexplained weight loss, loss of appetite, difficulty eating, swelling or lumps that grow rapidly, bleeding from any body opening, persistent lameness, difficulty breathing, and chronic vomiting or diarrhea. Any new lump should be examined by your veterinarian, especially if it grows quickly, changes shape, or bleeds. Early detection significantly improves cancer treatment outcomes in dogs.