It is painful to think that he trusts you and will be traumatized, but you will be surprised at how quickly he'll forgive you. He may not even connect you to what happened to him. especially if you baby him when you bring him home. We have a cat who HATES me. his mother rejected him the day he was born. He as very sickly, and I kept him alive by force feeding him, constantly clearing out his nose and lungs, and medicating him. As he got older, he only seemed to remember the pain I put him through. How ever, he loves my mom. Even when she medicated him.
He has mouth trouble and i have to medicate him every day to keep his mouth from being so inflamed he can't eat. For a while mom would play Judas goat and would lead him in o I can medicate him. Eventually he wised up and wouldn't come to her anymore. So now she lets me know when he is inside, and then she would step out. I would sneak in and pounce him, and when I am done medicating him, she comes in and "chases" me off, carrying on and acting protective of him. Now he clings to her more than ever.
In this case. I am the "vet" who does the terrible things to him, ad mom is his protector. I doubt the vet will let you "chase" them off or pretend to beat them up, but he will remember that you came and took him away from that awful place. As long as you make a show that you are there now and he's safe, he'll continue to see you as a protector. If you are worried about him loosing trust in you, request that his treatments are done when you are not in the room so he doesn't link you to the pain.
About the litter box, you can try soil, particularly something from outside with his scent in it. Look for a place where he has "gone" before and place that in what you decide to use as a litter box. You should probably keep him in a bathroom or laundry room until he gets the hang of things. This will help with any accidents he may have and he will be in a small confined space that gives you better control of his care. Make sure he has a hiding place in what eve room you choose, and with something familiar that he finds comforting in there with him. I use that extra oft blush silky feeling robes you can get this time of the year. I have yet to find a cat that doesn't love that material. You can also pick up soft fuzzy or fur like fabric real cheap form fabric stores this time of year too. We get it and cut them into small blankets to use on sick and injured animals. They enjoy the comfort and warmth.
You can also try a rubber hot water bottle to put under the soft fabric so he can have something warm to lean against. Domestic cats are social creatures. Yes they squabble and can be territorial, but when it comes down to it, they will more likely than not form bands and companionships with other creatures if given the chance, and because of that, the warmth of a "furry body" to snuggle up with is comforting.
He has mouth trouble and i have to medicate him every day to keep his mouth from being so inflamed he can't eat. For a while mom would play Judas goat and would lead him in o I can medicate him. Eventually he wised up and wouldn't come to her anymore. So now she lets me know when he is inside, and then she would step out. I would sneak in and pounce him, and when I am done medicating him, she comes in and "chases" me off, carrying on and acting protective of him. Now he clings to her more than ever.
In this case. I am the "vet" who does the terrible things to him, ad mom is his protector. I doubt the vet will let you "chase" them off or pretend to beat them up, but he will remember that you came and took him away from that awful place. As long as you make a show that you are there now and he's safe, he'll continue to see you as a protector. If you are worried about him loosing trust in you, request that his treatments are done when you are not in the room so he doesn't link you to the pain.
About the litter box, you can try soil, particularly something from outside with his scent in it. Look for a place where he has "gone" before and place that in what you decide to use as a litter box. You should probably keep him in a bathroom or laundry room until he gets the hang of things. This will help with any accidents he may have and he will be in a small confined space that gives you better control of his care. Make sure he has a hiding place in what eve room you choose, and with something familiar that he finds comforting in there with him. I use that extra oft blush silky feeling robes you can get this time of the year. I have yet to find a cat that doesn't love that material. You can also pick up soft fuzzy or fur like fabric real cheap form fabric stores this time of year too. We get it and cut them into small blankets to use on sick and injured animals. They enjoy the comfort and warmth.
You can also try a rubber hot water bottle to put under the soft fabric so he can have something warm to lean against. Domestic cats are social creatures. Yes they squabble and can be territorial, but when it comes down to it, they will more likely than not form bands and companionships with other creatures if given the chance, and because of that, the warmth of a "furry body" to snuggle up with is comforting.