We've had our puppy for two days now and he has been playing well with the kids. I have three children, 1, 7, and 9. Yesterday I noticed that when he was playing, all the sudden he got real aggressive with my youngest. I put our puppy on his back until he gave in. (Our youngest has not had too much to do with the puppy. He just sits and watches him.) Today the kids were playing with him again and he did the same thing to my oldest, she is almost 10. I did the same thing and put the puppy on his back until he gave in. I can't tell if he is just playing or if he is really trying to be aggressive with them. What do you guys think? Thanks!