Just thinking about this after discussing it with a good mate of mine. How much bull is enough for you in your dogs? We all know that bull blood gives that edge and guts and the willingness to push on where other dogs might wimp out. However, what is the smallest ammount of bull before you start to loose the edge you sought in the first place.
I've heard it said that like the collie gene, the bull "gene" if you like is very strong and will surface in your dog even if added in the most minute ammount, say 1/16 for instance.
Any thoughts chaps?