Our two cats, (both spayed): Lucy (female, 7 yrs.) and Skeeter (female 2.5 yrs.) have been co-existing very well until last week, when Lucy fell off a kitchen chair and got her paw stuck in a railing. She seemed fine after that, but suddenly became extremely aggressive with Skeeter. They have gotten into fights several times, and Skeeter is being extremely defensive, hissing, howling, and spitting whenever Lucy approaches. Lucy has also exhibited this behavior. At other times, they just seem to tolerate each other, but at a distance.
Help.
Help.