lisa1124 via CatKB.com wrote:
Hi all, I have two cats, Boo-3 and Bella-2 (both spayed). Bella has always
been playful and lovable, Boo is a little more independent but lovable and
used to occasionally play well with Bella. Now Boo has turned into a complete
bully with Bella - to the point that Bella is biting two spots on her back
(hot spots). Bella is constantly looking behind her back to see if Boo is
nearby. When she is in bed with me cuddling and suckling, she will constantly
stop, turn her head to see if Boo is nearby. Boo will chase her down and
rough house way too aggressively. The only thing new is a 37 gallon
freshwater fish tank. Also, I feed Bella in the kitchen and Boo in another
room. I do this because Boo wouldn't eat in the kitchen with Bella. Should
I feed them both in the kitchen in separate areas? How can I stop Boo from
being such a bully?

when was the last time you took the cat to a vet? sounds bad. i don't
know enough to suggest behavioral tricks. the fish brought out the
hunter in him? he's bored? he's not irritated physically? no parasites
- some things don't show up in the stool specimen. when i had someone
else's cat bully my cat, in the same house, finally i got so angry that
i really grabbed the bully hard. he stopped attacking my cat. i would
have picked him up by the scruff of his neck and had a good eye to eye
talk but he was too big.