Signs Your Cat or Dog May Need a Vet Checkup

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A concerned pet owner observing their cat and dog, looking for signs of health issues.

Knowing when your cat or dog needs a vet checkup can save their life and prevent minor issues from becoming major problems. This guide highlights clear, practical signs to watch for and what to do next, with actionable tips for both dog and cat owners.

Use these checkpoints to decide when a phone call or clinic visit is necessary, and learn how simple at-home observations can point to underlying health concerns.

1. Sudden changes in appetite or weight

Loss of appetite, sudden increased hunger, or unexplained weight loss/gain are common early signals of health issues. In cats, decreased eating can indicate dental pain, kidney disease, or stress; for dogs, changes may point to infections, endocrine problems, or gastrointestinal issues. If your pet refuses food for more than 24–48 hours, seek veterinary advice.

Before the visit, note what and how much they eat daily and check the food you offer—this is especially useful for cats. Consider reviewing your cat’s diet choices on the Food page to make informed changes only under your vet’s guidance.

2. Lethargy, hiding, or notable behavior shifts

When a usually-active pet becomes withdrawn, hides more than usual, or shows reduced interest in play and walks, this can indicate pain, infection, or internal illness. Behavioral changes can be subtle—watch for slower movements, reluctance to jump, or diminished tail wagging.

Long naps or resting more can also be a sign of joint pain or arthritis in older dogs; providing supportive bedding like a Furhaven Orthopedic Dog Bed can ease discomfort while you arrange a vet assessment.

3. Vomiting, diarrhea, or signs of dehydration

Occasional vomiting or soft stool can be normal, but frequent vomiting, persistent diarrhea, blood in stool or vomit, or signs of dehydration (dry gums, sunken eyes, decreased skin elasticity) require prompt evaluation. Puppies and kittens dehydrate quickly and should not be given time to worsen.

Track frequency and any changes in stool or vomit appearance, and avoid offering human medications. If symptoms are paired with weakness or fever, contact your veterinarian immediately.

4. Respiratory problems: coughing, wheezing, or difficulty breathing

Persistent cough, wheezing, open-mouth breathing in cats, or rapid/shallow breaths are red flags. Difficulty breathing is an emergency—do not delay. Allergies, heart disease, infections, or foreign bodies can cause respiratory distress in both Dogs and cats.

If you notice noisy breathing or a blue/gray tongue or gums, get emergency care without waiting for scheduled appointments.

5. Eyes, ears, and nose changes

Discharge, cloudiness, redness, squinting, or sudden vision problems in eyes deserve a vet check. Ear issues—foul odor, scratching at ears, head shaking, swelling, or persistent redness—often signal infection, mites, or foreign material. For routine ear cleaning or to help manage minor issues before seeing the vet, products like Pet MD – Dog Ear Cleaner Wipes can be helpful when used correctly, but they are not a substitute for professional diagnosis.

6. Skin, coat, and excessive scratching

Changes in skin or coat—bald patches, scabs, persistent licking, scaling, or sudden oily/dry fur—can indicate allergies, parasites, infections, or endocrine problems. Red, inflamed skin or hot spots need timely care.

Regular grooming helps you spot issues early. For cat owners, products in the Grooming category can assist with routine maintenance, but persistent problems should be examined by your veterinarian.

7. Limping, stiffness, or changes in mobility

Acute limping after an injury, progressive stiffness, reluctance to climb stairs, or signs of joint pain all warrant a vet visit. Pets often hide pain until it worsens—early intervention can prevent chronic problems. Observe how your pet rises, jumps, or maneuvers and note which limb is affected or if multiple limbs are involved.

If you need to transport a pet with reduced mobility, a sturdy carrier like the pet carrier bag can help move them safely to the clinic.

8. Changes in urination or litter box habits

Straining to urinate, blood in the urine, increased frequency, accidents in the house, or going outside usual spots can indicate urinary tract infections, blockages (especially dangerous in male cats), bladder stones, or kidney disease. These conditions can become emergencies; do not wait if your pet is repeatedly trying to urinate without producing urine.

Quick checklist before calling the vet

How long has the symptom been present? (hours, days)
Any changes in eating, drinking, or bathroom habits?
Is there vomiting, diarrhea, bleeding, or difficulty breathing?
Has the animal been exposed to toxins, foreign objects, or trauma?
Age, breed, existing health conditions, and current medications
Pictures or short videos of the behavior or symptom for the vet

Frequently asked questions

Q: How long can a healthy pet go without eating?

A: Adult dogs may skip a meal or two without immediate danger, but cats should not go without eating for more than 24–48 hours due to risk of hepatic lipidosis. When in doubt, consult your veterinarian.
Q: When is a limp an emergency?

A: If the pet is non-weight-bearing, shows severe pain, swelling, open wounds, or signs of a fracture, seek emergency care. Mild limps that improve over 24–48 hours can be monitored, but persistent limping needs evaluation.
Q: My pet has diarrhea—should I withhold food?

A: For short, mild episodes you can withhold food for 12 hours for dogs (then reintroduce bland, vet-approved food); kittens and puppies should not be fasted. If diarrhea is severe, bloody, or accompanied by vomiting or lethargy, see a vet.
Q: How do I safely transport a sick pet to the clinic?

A: Use a secure carrier for cats and small dogs. For larger or immobile dogs, support their body and consider a blanket or board. A reliable carrier like the Petseek Extra Large Cat Carrier can make travel safer and less stressful.
Q: Are ear cleaning wipes safe to use at home?

A: Ear wipes such as the Pet MD – Dog Ear Cleaner Wipes can help with routine hygiene, but avoid using them if the ear is bleeding, extremely painful, or has a deep infection—these require professional care.

What to bring to the vet

Bring a list of symptoms, recent diet and medication history, any samples (stool, vomit) in sealed containers if possible, behavior notes, and photos or videos. If your visit relates to diet or treats, consider referencing the Pet Supplies you use at home so the vet can advise on any changes.

Final takeaway

Trust your instincts: if something about your pet’s behavior or health feels off, a quick vet check can prevent escalation. Early recognition and prompt action often lead to simpler, more effective treatment and faster recovery. For routine comfort and support while you monitor recovery or await a visit, consider items like supportive beds, appropriate grooming tools from the Cats or Dogs sections, and safe transport options.