I picked up my gsd puppy this Wednesday and so far he has been acting like a regular puppy. My 8 week male is showing signs of resource guarding only with other dogs. My roommate has a young dog that loves to play with my puppy but when it comes to toys the puppy snarles at the other dog. I can play with him as he eats or play with his toys and he is totally fine but with another dog he gets upset. I’ve seen some positive play between them and even with a toy involved but more often than not the puppy gets upset. Any advice would be great and appreciated!