UrbanVet Blog

When Should My Pet See a Veterinarian? Important Warning Signs in Dogs and Cats

March 8, 2026

Illustration of a dog and cat with symptom markers and a veterinary checklist about warning signs.

Most pet owners know their animals very well. Small changes in behavior or health are often noticed quickly. However, it is not always clear when a veterinary visit is really necessary.

As a mobile veterinarian in Berlin, I often see pet owners who are unsure whether they should act immediately or wait a little longer. In general, it is always better to ask a veterinarian too early rather than too late.

The following warning signs should always be taken seriously.

1. Loss of Appetite

If your pet suddenly stops eating, there can be many reasons.

Cats require special attention: 24 hours without food can already become problematic.

Dogs should also be monitored closely, especially if other symptoms such as vomiting, diarrhea, or lethargy occur.

2. Vomiting or Diarrhea

Occasional vomiting or diarrhea can sometimes be harmless.

However, if the symptoms occur repeatedly, last longer than 24 hours, or your pet appears weak, a veterinary examination is recommended.

This is particularly important for puppies, kittens, or older animals, as dehydration can become dangerous quickly.

3. Limping or Signs of Pain

If your pet suddenly starts limping, avoids movement, or shows signs of pain, the cause should be investigated.

Sometimes it may simply be a minor strain, but in other cases injuries, joint problems, or foreign objects could be involved.

4. Changes in Behavior

Sudden behavioral changes can be an important warning sign, for example:

  • unusual tiredness
  • hiding or withdrawal
  • aggression or restlessness
  • unusual vocalization

Especially in cats, behavioral changes are often one of the first signs of illness or pain.

5. Problems Urinating or Defecating

If your pet has difficulty urinating, goes to the litter box very frequently, or shows blood in the urine, this should be examined by a veterinarian.

In male cats especially, a urinary blockage can become life-threatening.

6. Coughing or Breathing Problems

Persistent coughing, rapid breathing, or breathing difficulties should always be taken seriously. These symptoms can indicate infections, heart disease, or other health issues.

7. Wounds or Injuries

Even smaller wounds can become infected. Bite wounds, deep cuts, or strong swelling should always be evaluated by a veterinarian.

When in Doubt, Act Early

You know your pet best. If you feel that something is not right, it is worth having it checked.

Many examinations can also be performed during a veterinary home visit, which is much less stressful for many animals.