>>i am considering agility. i am also considering getting another dog. i was wondering, what breeds do best in agility?
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>>i am also wondering where to get agility equipment for the dog to pratice? and what books on agility you would recommend? do you think it would be better to hire a handler or to do it all myself?
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>>thanks for any help you can give me. i am ever so greatful.
Everyone has give great advice! I will just add my 2 cents for whats its worth 
I have been doing agility with my dogs for about 7 years now. Yes it is great fun and I truly enjoy it as well as my dogs. Agility can be for everyone and every dog. We once had a 3 legged dog in our agility club, and our oldest member is in her 70's! The key is to have fun and bond with your dog, be able to laugh at yourself and never ever think it is your dogs fault! LOL!
I started agility with, believe it or not, a Chesapeake Bay Retriever. He does very well, knows all of the equipment by name and does his contacts just great. . .the thing is we usually get time faults because he is not a fast dog and enjoys taking his time, which is great because we are accurate, but not fast. I was given a Border Collie. Didn't really know what this breed was all about until I got her and started researching about them. Oh yes, they are very very fast and extremely intellegent, more so than I am! LOL! Anyway, a very different dog and now instead of trying to motivate one I have to try to keep up with the other and think a step ahead!
Another thing to consider is that Borders and Aussies do tend to dominate the sport and since there are so many of them it is a much more competitive event and many more dogs to go up against. I have found that with the larger breeds at the 24 and 26" height there are less dogs in the class to compete against. Also in the 8 to 12" height classes there don't seem to be as many dogs competiting.
I also agree that Papillons excell in agility. Find out if there is a group or club near you of if there is a trainer near you. There are tons of web sites and books and advice out there but I will say that trying a few obsticles with your dog in your own yard would be able to tell you if it was interested in agility. Good luck to you and make sure you report back to us!
I'm attaching my favorite pic of my BC gal. This was taken at her first trial and she did awesome!

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Charlene 
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Adopt the pace of Nature
Her secret is patience
-Ralph Waldo Emerson-