recently aggresive 2-1/2 nuetered labrador
I have a 2-1/2 year old neutered lab who in the last 6 months has become aggressive to adult male unknowns he is great with familiar males, women and kids. I'm not sure what brought on the behavior and I need to know how to get him past this. He is kenneled whenever we are not home but is with us or allowed to run the acreage when we are with him.I will take any and all suggestions. Thanks!