Hi all, I hope y'all can provide some guidance and tips for my two kittens to introduce to be one another.
Resident Kitten's backstory:
He could be consider as a rescue, and his name is Somnus. I named him Somnus because he sleeps so much. Here's a bit of a background on him. His foster was what I would like to call incompetent fosters, because he came to me dehydrated, cold, lethargic, ANEMIC due to fleas at an age 5-6 weeks old. When I got him, he was only 350 grams. He was also BULLIED at his foster by their own older cats. Those first couple of nights were difficult as I didn't know if he'd make it through. Fast forward 2 weeks, he is now perfectly healthy, active, extremely playful and tons of energy when he's awake. He was a singleton, so I also knew I needed to socialize him with another kitten so he learns how to be a cat and etc. I waited until he's back to a normal weight because I feared the 2nd kitten would be bigger than him, and he'd be traumatized by the sight of a larger cat since he was bullied before. I also work from him, so he had all of my attention since I've got him.
2nd Kitten's backstory:
I adopted her from a litter in which she seemed excluded from. The foster was extremely responsible and upon inquiring, she told me among the litter, there was one kitten that appeared to be excluded from the other kittens. She was also the smallest of the litter. So it appeared to be the perfect playmate for my Somnus. Someone smaller and can be removed from a situation where she was being excluded from her littermates. When I visited the kittens, she was definitely more isolated and excluded from the other 3 kittens.
Somnus, the resident kitten (~8 weeks) is curious about the new kitten (7 weeks). He'd follow her around but would growl quite a bit. Upon face to face contact, he would hiss. The new kitten is curious about her new home, perfectly happy to explore and would also follow the resident kitten around. But I think the resident kitten is making things difficult for the new kitten to feel like home. Under my supervision, there has been no fights or swats. Just growling from the resident kitten. I wonder if it's because he was a singleton, bullied and traumuatized by a rough upbringing, and possibly spoiled by me because I gave him so much attention while nursing him back to health.
1) Should I extend the isolation time between the two kittens?
2) I'd like to try calming pheromone to help calm the kittens (particularly the resident kitten, Somnus)
... anything else you'd recommend?