[brunie's mom]

This is called a martingale collar. I don't blame you for needing more control then a flat collar for her.
One thing that I was told before any agility training was started...that the dog must have very good obedience under their belt. What other obedience classes have you had Peaches in? Maybe it would be better to get into a higher level of obedience classes with her...and only then start in agility?

Also since you do have such a big bitch, maybe agility is not the best sport for your dog? Does the littermate to your pup not have HD? I would be worried about a large dog doing bouncing and jumping without having x-rays done on hips and elbows.

I would talk to the teacher and explain that you need more control on this dog.

Gina