we have a 1.5 year old tri who was acquired at 4 months so he has spent considerable time with the wife and myself. yesterday we purchased an 8 month Blem. also a male. at the breaders they were fine, did not play together but that may be part to the other dogs around. also our dog has not learned to play with other dogs as he meets other dogs only during walks. at such meetings he is fine and appears to enjoy the sessions.
once home our older tri became very aggressive and could not be trusted with the puppy, had to pull the tri off several times. of course, now the puppy is uncomfortable and afraid to leave our side.
Is this normal, how is the situation alleviated. many thanks for comments