> I did tell the lady owner about how grossly over weight her dog was but used to just giggle about it
Thats' awful :( It really makes me cross to see fat pets. I am very vigilent with my dogs weight and get criticised for being too strict with treats (or
lack of treats), far to many people put thier pets health at risk by stuffing them with food :(
Sorry to go off topic here.
The suggestion for distracting your dog with a toy sounds good :) Humping can be through through play, especially when they get too exited, so calming him down with a time out on lead may also do the trick. When my oldie got too exited playing with my pup he would hump him (both males, the oldie was neutered), I would just stop play untill he had calmed down.