Our 2.5 year old Lab has been going to the same off-leash dog park his whole life. Lately every single time we go he gets singled out by one or more dominant dogs and 'bullied' (chased, mounted, etc) non-stop. He's so submissive he won't fight back (which is good, overall!) so it just goes on and on until we have to rescue him and leave the park. Anyone else have this issue? He's been neutered for over a year so I can't think what all these dogs are suddenly so interested in.