My cat Leo had all of a sudden started shaking and running through the house, then hiding for hours at a time. He won't cuddle or even eat a treat. He does go outside, but not all the time. He has all his shots. What could have happened to make him act this way?

My cat is just over a year old, she's not been spayed and never had a litter. She's started acting strange, sleeping on my bed a lot, like all day, and sleeping most of the night too. She also tries to burrow in a lot of things, like pillowcases. She doesn't eat that much, and meows like crazy. She...

My 4 month old kitten started acting weird one day. We brought him to a new home, but he opened up right away. Sleeping with us in bed, purring all the time, and just loving all the attention. Now he's trying to hide everywhere, hissing when my boyfriend comes up to him, just laying in the little...

hello =] Well, I have a 3 year old cat who has been acting verrry strange lately. For about a week she's been sleeping almost non-stop, she barely eats or uses the litter box. She won't even open her eyes when I go up to her while she's on my moms bed. We don't know what to do.. any advice?

Hi-i gave my cat advantage flea treatment and now she is acting weird. She hisses at my other cat but likes to be by me. She has been hiding but comes out and meows very loudly when she hears me. Usually she bonds to the other cat not me. She doesn't look sick but maybe she is... Or do you think...