Shawn Messonnier, dvm is in Plano, Tx as well and i have read a lot of his books. He seems very knowledgeable - I would look him up as well - he is the author of allergy solution for dogs and many other Natural Vet Series
Paws & Claws Animal Hospital
2145 West Park Boulevard, Plano, TX 75075
http://www.petcarenaturally.com
(972) 867-8800