You've gotten some good advice but I'll add a few tips.
1. Patience. This cannot be overstated. You have to introduce them to each other VERY slowly. It could take months for the two of them to be okay with each other.
2. Keep them separate. Do not allow them to be in the same part of the house.
3. Scent swapping. Have them sleep on blankets,...... 1 reply
I am going to put aside your question because what you've said about your dog concerns me. Have you taken your dog to the vet? I do not own dogs, but the smell you describe does not sound normal. He should not stink if he gets bathed and groomed regularly. His farts should not be rotten if he's on an adequate diet. Sounds like something in his diet...... reply
did is a worthless piece of shit
