Hi there...
I just wanted to add, that you have to give him some time and some training. Not only is he in a new home, but he just got neutered.
When TJ was neutered, he was so good about do pee on the pads, but when I brought him home, he started to pee all over the house, on the floor, on the carpet, on his dog beds, on his toys. I was so upset. I called the Vet after a couple days of this and the Vet chuckled, he said TJ is mad at you for getting him neutered. Honestly, I didn't think that dogs could be mad at you, but I guess we will never know...
Anyway, I just went back to the positive praise, treat reward and limited freedom in the house (strict potty training) and after a while things got better
