Difficulty breathing. Consistent refusal to eat or drink after the first 24 hours in a new environment (failure to eat on the first day your kitten or your cat has changed the environment is very standard). Bleeding of any kind. Dry mouth or panting, indicating dehydration.
Kittens are actually more fragile than they appear and problems can arise quickly. The big three things I see are hypothermia or low body temperature, hypoglycemia or low blood sugar, and dehydration. When a kitten is unwell these are the three reasons we usually see.
A healthy cat that is just sleepy will respond to your touch; he would open his eyes and maybe move a little before falling asleep again. A lethargic cat, on the other hand, will not respond to your touch or any stimuli. He won’t budge if you open a bag of cat food.
General signs of a sick kitten include: lethargy, weakness, decreased or absent appetite, less interest in play, more sleep, vomiting, diarrhea, weight loss, trouble walking, and less interest in owners, companions, and toys. The very first sign of many sick kittens is not wanting to eat.
Sick cats typically show changes in overall appearance, energy levels, sociability, coat appearance and/or shedding, appetite, litter box use, breathing, or eye or nasal discharge . In general, any sudden change should alert you that your cat needs veterinary attention.
Signs of a depressed cat
Changes in body language, including flat ears, tucked tail and standing hair. More or less meowing than usual, or low, sad meowing. Lack of energy or a drop in activity levels. Retreat from humans or other pets.
Anything from a stuffy nose to intestinal parasites, constipation or an upset stomach can contribute to your kitten not eating. That’s why it’s very important to seek professional help when your kitten isn’t eating. The vet will be able to distinguish between a nervous eater and a kitten that needs medical attention.
If your kitten is feeling weak and sleepy, there is a high chance that she is not getting the nutrients and/or fluids she needs. Providing your cat with these important nutrients can provide the body with the energy it needs for a speedy recovery. Therefore, you must monitor your food and water intake every day.