Cats don't stick their tongues out because their cooling system primarily relies on the pads of their paws, unlike dogs which pant to cool down when hot. Cats also have underdeveloped sweat glands, making them less prone to sweating.
Cats sometimes stick their tongues out: 
1. When a cat sticks its tongue out a little, it may be to relax or lick its fur.
2. If the cat is sticking out its tongue due to stomatitis or other reasons, it is necessary to check whether there are any abnormalities in the cat's mouth.
3. If your cat exhibits symptoms such as oral swelling, drooling, or loss of appetite, you should take it to a veterinary hospital for a check-up.
