So I have a 44 pound 19 week old male golden retriever puppy that I have started in doggie daycare. I set him up to go twice a week when nobody is home all day. I brought him in the morning and he seemed to be fine, and called once during the day and they said everything was going good. The people at the daycare said they where going to keep him in the room with the littler dogs for the day dogs such as yorkiee's. When I went to go pick him up at the end of the day they said he did really well in that room so they moved him to the other room. The other room has full-grown large and medium sized dogs and the youngest dog in there besides Charlie is a 10 month old husky. When I picked him up he was fine and seemed happy to be there and fine. I brought him home and he ate a little and then slept for about four hours. After he woke up he seemed to have some aggressive behaviors such as growling at me when I took away paper he was chewing and growling and barking when I went to put him in his crate for the night. I was wondering if you could tell me if this is normal dog behavior after being in a new environment and around new dogs/people or something to be concerned about. He has not had much exposer to other dogs only trips to petco, and he has been around our cats.