aggieterpkatie
The Shepherd
- Joined
- Oct 23, 2009
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- 3,696
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Some horses are hard keepers. There was a TB mare at my college farm (where I worked) and NOTHING would put weight on her. We tried everything. We had her scoped for ulcers and everything. She was just a hard keeper. Didn't look too much different than your guy, actually. 
A few ribs show on her ever so slightly, which is normal for a TB. I still get people wanting to know why she's 'thin'. Its usually non-horse people that ask this question however, the ones who think all breeds should be built like a big stout quarterhorse and a coat as sleek as a racehorse, even in the dead of winter! That drives me crazy.