Well if i remember rightly, when i was a fair bit younger, my eldest sister did agility with one of our Staffies, when w ebred them,. We had kept a little brindle bitch, whom didnt take to the show ring, so Drew became an agility dog. She was very good actually, i saw her out do a border collie once too, but yes Naomi u have to be very fit and fast to keep up with them LOL
best wishes