My boxer Kingston is a sweet boy and typically gets along with all dogs and people. Definitely not a dominant boy as he has no problems Allowing other dogs to bully him. He shares food, toys etc. but recently he has had issues at the dog park with two male puppies. Where he seems to generally like them. Licking playing etc. but then stands over them and if other dogs approach the puppy he lays on him and growls. At first i thought maybe he was being aggressive to the puppy. But he seems to really like him. Have you ever seen a boxer become possessive over a puppy or other dog?