Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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Dr. Getty
Hi Cindy,
I expect this is extremely frustrating. You're doing everything right. I would recommend that you have him allergy tested. He may be allergic to something that you feed him everyday (perhaps even flax!) that is making it impossible to counteract.
Have his liver tested -- you'll likely be doing that. And finally, give him a buteless pain reliever such as SuPer Substitute (comes in a liquid or powder) since this will dull the nerve endings.
Keep me posted,
Dr. Getty 
Author of Feed Your Horse Like A Horse
I am still having great difficulty with my senior Percheron's allergies
He is still scratching huge sores on his rear end, between the hind legs and his chest!I increased his Spirulina--giving 3 TBS a day (1 TBS per meal), added the Vitamin C, and GroStrong minerals. He is still on Flax (Grand Coat) and also had to get Hydroxyzine from the vet--which is not working. I am so frustrated as to what else I can do to help him stop itching? I do apply a topical spray and gel on the sores and in his tail daily.
I will have my vet out in a few weeks for annual blood-work--are there any specific tests I need to target? I usually do a CBC, Chemisty panel, Insulin and Thyroid.
Thank you!
Where are you from? Bayfield, CO