sick cat

sick cat

I have a question, my daughter's pekinese cat is acting really strange. Does that mean he is sick? Usually he is very laid back.....actually a bump on a log.......lately he's been zooming around the house, jumping on furniture, his meow sounds different, his eyes are dialeted more than usual, hiding in the cupboard. Is that a good sign or bad? I would appreciate all the help....I'm not really finding much doing websearches. THANKS A BUNCH! --Resa