Hi there, i have just moved in with a friend who has two female cats that are not fixed, Baby (1.5 year old) and Bell (3 month old). My nuetered (8 month old) male cat, Diego, has been here for 2 weeks and is super friendly, playful, and gets along with Bell, the 3 month old kitten. HOWEVER, the older cat, Baby, is in heat and is very mean, vicious and physically attacks Diego especially when she is in heat.
My roommate has made an appointment to get her cat spayed, but i am concerned if her behavior will change for the better after she is fixed, or will Baby continue to be mean to Diego? My main concern is Diego's well-being and happiness, and i will move out if need be.
In the mist of this stressful situation, Diego handles it very well. He eats, uses the bathroom, and plays with the kitten freely. However, once the older female cat in heat comes around, he becomes very stressed and scared, which leaves me uncomfortable. What should i do???