Thanx for all the dog walking replies, I will try them all and let you know, but another thing he does, which I've tried to ignore is get his willy out and it really looks hard and painfull, he's been 'done' and that seemed to have cured it for a while but now the kids are noticing too and don't know what to tell them, don't want to tell him off too much as not his fault but really don't want this happening as much as it does? (he's a lovely dog otherwise........apart from the tugging on lead and being an exhibitionist!.............any ideas?
some dogs just are flashers, difficult but there you are but there are two possible medical causes which you might like to get checked out. One is incomplete castration ie a "bit" has been left in the dog, the other thing it might be is a prostate problem. Both things are dealable with.. good luck!