
No responsible BC breeder would breed for fine bone whether they be ISDS/show/obedience/agility/WT/flyball. The finer the bone the more likely the dog is to have broken limbs or other problems with the long bones & spine
There are smaller BCs around & not all are rough coated My puppy is a smooth coat & not in the least hairy. He is not fine boned but a slim lithe dog like his mother with boundless energy & like 90% of working bred dogs very quick & agile
My puppy BTW is working bred & has been going round sheep(just like his brother kept by the breeder)since they first saw them at 7 weeks
ISDS dogs are
never bred for their looks but for their ability,