clippers..
Looks like that's the answer.
Clippers are a choice but you should also try a product called Cowboy Magic. It is a product that horse owners use to get burrs out of horses manes and tails. I have a Springer and use it on her when she gets into the burrs. It comes in a 10 ounce bottle you squeeze a little out and work it in with your hands and then the burrs pull or comb right out. You can get it at Mills Fleet Farm or Theisens in the horse department.