So happy to see this post but very sorry to hear about your situation. I also am planning on getting another pup after the holidays. But when anyone comes here with a dog so that Diezel can have a play date he will entertain the the dog for maybe 10 minutes an then does not want anything to do with them. I have had friends come over with dogs from the first day Diezel came home because I wanted him to be socialized but he just seems to care more about people then other dogs. He doesnt really avoid me and there was only 1 situation where he tried hiding in the bedroom when I had a lil furbaby guest for 1 weekend but I put the other puppy in the bedroom so I had some alone time with Diezel and then he seemed to be fine after that. But my biggest fear is also that it will changed Diezels personality long term. Diezel is so friendly and affectionate with me and anyone else who comes here I dont want bringing another puppy in the house to change the way he loves me or anyone else.
I wish you the best of luck with your new addition to your family
I am sure I will be posting a similar post to this one in the future!