Yes, we are competing in Rally. Lily has two legs so far
About the "lack of briskness"... It all depends on a judge. Some are very nice about it and do give you extra credit for bringing your monster into a ring, LOL!
But if you read Rally rules you will see that it does say "the dog must heel briskly" or something like that
We used to have the same problem during training and one of the teachers had noted that I am slowing down because I think that my dog is slow and big. She told me to increase my speed 3-4 times and Lily actually loved it and gave me more attention than what I was getting before.
Good luck, it is so much fun!!!