Well I had a dog and he was a big dog and he deffiantly didn't like other girls dogs and wouldn't tolerate them bouncing all over him so I did have to keep him from snaping, the growling I knew he had to tell them off some way to let them know he wouldn't tolerate. I think all dogs no matter the size should be trained I think most can agree. Just because its baby sized doesn't mean it is. I remeber one time one of the girls at school told me my dog was going to attack tucker (teacup yorkie across the street) bunch bull when I went over to talk to them they said Clifford was just coming over to socialize, he isn't a mean dog just steped out of the yard to mingle. They just took Tucker inside b/c they didn't want to take chance with Clifford being without a lesh and not sure of his temperment. I can just imagine him thinking everybody wants to pet him he is kind use to that attetnion from strangers. Again another situation where people just assume my dog his some ruthless beast and the small dog is victim. Clifford was well behaved for the most part and I had him in 4 yrs of 4-H dog obedience. He use to be able to walk off leash but when training stops things tend training that doesn't get used much gets lost.