I don't agree with that.... Well trained dogs can easily become a nuisance especially after a chase and a catch, my old Collie cross was pretty well trained until out with other dogs. Jealousy got the better of it when out hunting, nothing worse than seeing a dog running all over the place with its catch getting chased by another dog.that's the fecking collie coming out my mates Hancock bitch does exactly that at arse whole of a dog the same bitch killed a pup outa jealousy