In fact Border Collies are SO good at agility that another class of agility has been formed to allow other breeds a look in! If you have a Weimaraner, Great Dane, Dachshund, or mutt you can enter them in the 'ABC' class -- Anything But a Collie!!! Any collies, or collie cross-breeds are not allowed to enter. So how can you tell whether they are a collie cross-breed or not?
Blackdog DNA will tell you what the genetic heritage of your dog really is! Simples!