Cause to hives??? - The Horse Forum
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post #1 of 3 Old 04-28-2013, 04:53 PM Thread Starter
Join Date: Feb 2013
Location: Nevada
Posts: 9
• Horses: 4
Cause to hives???

My mare, Vegas recently broke out with hives all of a sudden after starting her on a biotin supplement and when we bought an orchard grass hay. She has been getting the same hay from the same ranch all winter and this orchard grass was also from the same place. She has eaten their grass hay previously and has never had any problems. After discontinuing the grass and the biotin supplement, the hives were almost gone within the 48 hours of appearing. I went down to the vet still and picked up a shot(some kind of steroid) and antihistamine granules. The hives were totally gone for about a week and a half. They have came back though. They are A LOT smaller and in less places but are still there so she is obviously still in contact with whatever she is allergic to. She is on the same hay she has been eating for months. She is only getting the purina minerals scoop as a supplement and getting her 9 lbs or so of hay each feeding. I looked around the property for any ants, weeds, etc. but there is no plants to eat nor bugs. Flies have not really came out for this year.
My horses have been on this new property for approximately 5 months and have not had any issues. but maybe there is something in the dirt that is bothering her??? I have no clue at this point as to what are causing these. Any ideas?

last picture is probably 2 days after the other pictures.
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post #2 of 3 Old 04-28-2013, 07:14 PM
Join Date: Jun 2012
Location: AZ
Posts: 396
• Horses: 1
Tacking down the source can be super hard. The first thing I would try is her hay, switch it out or water it down. She could be sniffing up some of the dust or hay. She could also be having it due to the warm weather. The list could go on and on. Water everything down. Try putting a sheet on her for a few weeks. If its something that she is rolling in the sheet will prevent it from coming in contact with her coat. Then you know its something she is rolling in.
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post #3 of 3 Old 04-30-2013, 12:45 PM
Join Date: Sep 2012
Location: Oregon
Posts: 23
• Horses: 0
One of my horses broke out in hives after feeding a manufactured horse feed that I had been feeding to all the horses for years. I only gave it to him once a week as a treat. Hives gradually faded during the week. Next week I gave him the same treat and he broke out in hives even worse. So I was sure it was the feed. I stopped buying it and changed stores and brands. He has not had another hives attack. Manufactured feed can look fine but they may have used moldy ingredients to make it or included some allergen by accident.

Another old mare had a hives attack after a colt apparently broke in with her and probably chased her into a bee nest. When I saw her the next day the colt was where he was supposed to be and looking angelic but I found the break in the fence so I just had to deduce the problem. The hives cleared up on their own and she never had another attack. I of course mended the fence.
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