Has anyone had experience with a PPID gelding displaying unusual aggressive behavior toward humans? He’s always been sort of a grumpy Gus, but came at me with pinned ears, snake neck and intent when I tried to halter him. I’ve researched and found “can be caused by testosterone which geldings with a pituitary tumor can have increased levels of.” Vet visit scheduled but curious in the meantime. Thank you!
A little scary, and perhaps out of context…but has this horse been vaccinated for rabies?
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If a horse suddenly becomes very aggressive it can be a brain tumour.
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All I can add is Jingles! This sounds so scary for you and the horse.
Hope the vet can get things figured out.
Is he on Prascend? Has the dosage changed?
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He us UTD on all vaccinations including rabies.
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Been on Prasand at same dosage for years.
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He’s gray with melanomas so something internal perhaps? He will get a full work up and will take it from there. Thank you everyone!
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Wishing you good luck and good news from your vet. Do be careful in the meantime. 
