I really wouldn't say she is a straight border/staffy cross. Looks like there could be something else thrown in there....she really doesn't look all that bully to me actually. And certainly not like a purebred border.

I know Border/Staffy crosses are popular in the flyball world. I've actually seen quite a few of these crosses. This dog doesn't look like any of them honestly. As I said i'd be willing to bet that there is something else thrown in there.