Ok Alcide is 7 months now and loves his fetch and ball play every day (I take it away when we're done with it). He's been well socialized with people as well as other animals. When we were at the dog park the other day he starting getting very aggressive with other dogs when they came towards his ball only other time Ive seen him get like this is when a stranger comes near my 3 year old son.
Any suggestions to curb this? I was thinking to separate ball time and dog park time and just not bring the chuck it stick and his ball on park time.