I'd suggest, first, meeting other dogs in a neutral location. Dogs tend to protect their own turf.
Second, leash all of them until they prove they can play nicely.
Third, don't give up. If you take charge of the situation, they'll catch on pretty quickly that they don't have to be mean.
Good luck.
__________________ Mike ~ Doting Dad to Jillie, Harper, Molly, Cooper, Eddie (RIP), Lucy (RIP), Rusty (RIP) and Jack (RIP). Check us out on YouTube |