My aggression issues were not caused by my 1 1/2 y/o pitty it was by my 8 y/o mastiff. I felt it was a dominance issue showing my pitty who was the leader. One day I couldn’t separate them fast enough and my mastiff ended up with 12 staples and my pitty received minor head wounds. What I found in my home that has worked great is the crate and rotate method. Everyone gets time and everyone is safe.
Check out http://www.PBRC.com they have amazing information on numerous subjects petaining to pitties.

I was going through toys by the minute with Beastley. “The Almost Indestructable Ball” was worth the $12.00 I paid for it. You can get it online at PetSmart.com (I couldn’t find it at the local store). It comes in 2 sizes and you can put water in it to make it more of a challenge. Beastley plays with it for hours and as of yet hasn’t figured out how to destroy it. The hardest part is getting it away from him to rest.