We have an 8 year old neutered Goldie. He’s a bit of a dream now (after much training) but in the last 2 or 3 months he has started suddenly jumping on dogs on the lead, especially if he’s off lead. We live near woods and most of the other dog walkers are neighbours he knows well and he usually gets on with everyone. But he’s just started jumping a bit aggressively on dogs he knows well and has interacted calmly with in the past. This evening he jumped on a neighbours rescue dog who used to be very nervous but has come to be good friends with ddog. It’s sort of aggressive but more over enthusiastic play.
Of course he is now firmly on the lead and not allowed to approach other dogs, even his “friends” but I am worried he’s going to get a reputation as a hooligan, or get hurt. He did it at the weekend to a large GSD he has known since it was a pup and has always been fine with, luckily by the time it reacted I had grabbed him but since then it reacts to him (understandably).
Any ideas why he’s doing this now and how to stop him, he used to enjoy pottering off lead and greeting everyone nicely but now we can’t let him