Signs of dehydration in cats are very important to recognize, as dehydration can lead to serious health problems. Here are some signs that your cat may be dehydrated:

1. Dry lips:
Dry or chapped lips are a clear sign of dehydration. Healthy lips should be wet and not dry.
2. Sunken eyes:
If your cat's eyes look sunken or lack luster, this could be a sign that they are drying out. Healthy eyes should be bright and sharp.
3. Decrease in energy:
Dehydrated cats can be less active, sleepy or lack energy. If your cat is not playing or acting differently than usual, this could indicate dehydration.

4. Change in appetite:
A dehydrated cat may not eat or drink normally. If you notice a decrease in appetite, this could be a sign that there is a problem.
5. Skin test:
Try to gently pull your cat's skin between the shoulders. If the skin does not quickly return to its place, this can indicate dehydration. Healthy skin should immediately return to its place.
6. Dark or scanty urine:
If you notice that your cat is urinating less, or that his urine is darker than usual, this could be a sign that he is dehydrated.
7. Bad breath:
Bad breath can be a sign of mouth inflammation or other problems that can result from dehydration.

8. Hyperemia of the gums:
Check your cat's gums. If they are very red or dry, this could indicate dehydration.
9. Change in behavior:
Dehydrated cats may be more irritable or show a change in their normal behavior. Such changes can help identify a problem.
Contacting a veterinarian:
If you recognize one or more of these signs, it is important to contact a veterinarian as soon as possible. Prompt treatment can prevent serious complications and restore your cat to good health.