Join Date: Jan 2011
Location: North Dakota, USA
The first things I would have checked are what had changed in his routine and feed that might cause it. Since you've said he's had the same routine and feed, and everything appears normal, those aren't factors. As long as he is not getting dehydrated or losing weight or mass, I would agree with your vet. You could try probiotics which may help, but usually it works itself out.
Everyone should be allowed at least one bad habit, and that's NOT owning a horse! Mares RULE! Geldings drool!