I'm afraid to say that a lot of them are caused by people(some on here and other forums)not being able to get the best out of there dog,and,think that it is easier to go on to the next one.I tackled someone on here(I think-if not smoochers)who said that he was on his seventh dog in two seasons,and,his answer was to mind my own f*****g business!As long as these f*****g Knobends are in the dog game then you will have spares in all of the kennels........RANT OVER!