my mom has a femle cat and i have a female cat, and i live with my mom and theyre always fighting...i got my cat last year in january and she was 9 months old from a shelter...and they fought a lot then and its seemingly getting worse after over a year of living together..and when blue is meowtie (comes in heat) the fighting gets worse (my cat is spayed..i cant imagine if both of them were in heat how bad the fighting would be) i thought that once cats lived together for a long time they became good friends...but our cats are always scrapping over the spot on the chair...or sometimes one nips at the other ones thigh as she passes by and that starts a fight...its not a big problem but i wish they would get along better and not fight so much...one time blue got a claw stuck in her eye and her eyes got watery and stuff for about a week and shes had some bites on her that i know were inflicted by stripey (my cat) my cat is bigger so she usually wins the fights, blue is 7 lbs and stripey is 11 they also attack the dog but he just runs away usually...i just wanted some advice on why they do this and what i can do to help them get along better