Welcome, Charlie and family!

I have a similar story to yours -- I adopted my 4-legger Jery when she was just a few weeks old, and she had the run of the house for about 6 years until I adopted my 3-legger Jet. I tried same method you did, introduce them slowly etc., but she's never accepted him as a buddy. They tolerate each other, and fight often, but it seems to be mostly play-fighting. Sometimes they get carried away, then I step in and break it up. But it's all good!

Yeah 3 weeks isn't very long. They'll find their groove soon enough.

As far a having a 3-legged cat, I don't really see a difference. Both my cats act very, um, CAT lol.

Does he have any problem using the litter box? And any idea how old he is?

Brad

How are you guys doing?  I have some suggestions that may help you out, I hope things are going ok over there. Huck was a huge handful when we first trapped him and took him in. And we did introductions the same way that you did with a few adjustments. I started by letting Huckleberry meet Andy and Oscar separately first, just so that nopawdy felt overwhelmed. 

They all got along pretty well for the most part. Oscar was a 5 week old feral kitty when I took him in. He came from a long line of feral as I work on government property so all creatures great and small here are protected and they do not encourage interaction. It just so happened that Oscar was sitting on the suspension spring of my boss' cars right front tire, lol. Once he was caught he thought he was a mountain lion and tried to eat us all.... I ended up putting him in a box with a towel and called my husband. He came to the office and I handed him the box and asked him to put the box in our spare bathroom with the door closed until I got home shortly after.  It took him about 3-4 days to stop hissing at us every time we opened the bathroom door, but he was so small and so young that it really didn't take too long to convince him that his new home was better than sleeping under cars.

Long story shortened a bit... Oscar looks at me as mama. I am still mama. Huck was a threat to Oscar, but they now live pretty well together. Once in a while I have to separate them, but as time goes on it is further and fewer in between.

I have Feliway plug in's and Feliway spray that I use in the house even now occasionally. I spritz the cat trees when they are not occupied, and I keep a plug in at any place that seems to spring tension between them. In the beginning for quite a while I used something called Rescue Remedy. Just a few drops in their drinking water each day and I do believe that helped as well. 

I did have to let them work things out between each other to an extent. As long as there was no screaming or aggressive chasing I just kind of let them work it out. Every time there is a major change in your home, what I call the "pecking order" changes for everyone, especially when a loved one crosses over. 

I am going through the process right now as one of our dogs crossed over a couple of weeks ago. It takes time.. lots of time and patience. Give your girl extra cuddles and attention, I really think they grieve just like we do. Everything you are describing about your new addition sounds like stimulation overload coupled with recent surgery recovery. 

Charlie is going to need to check every crevice and corner in the house as he grows his roots and settles in with his new family. He looks young (he is GORGEOUS!) and he has been through a lot. Definitely expect it to take time to transition and get settled. Trouble may find in time that even begrudgingly she may learn to like and accept her new brother. It is definitely going to take time!

I am so very sorry for the loss of your Domino. I know how hard it is to lose a loved one. I think he maybe even coached your way to Charlie. That really sounds like a "meant to be" kind of meeting. 

I wish you luck with your new addition. Have you tried catnip for the both of them yet? That can also be a stress breaker!

Hugs,

Jackie and Huck