I'd have to agree with Lilie, poor guy had some massive changes in environment. It sounds like he had to escalate his "NO" or "Knock it off" when dogs mounted him. More like a "I MEAN NO!!!!!"
And, to be honest....Boxers just don't take "NO" unless it's a in your face lots of exclamation points put on the end of the statement. Bulldogs are the same way.
If I was leashing my dog and a dog came up and mounted her then I'd be the one to literally shove it off. That's a space issue.
Gunny GSD & Zoey the Weasel
Sean M. Walsh K-9 Memorial Fund
our goal is to help police agencies establish and maintain a canine team in memory of Sean