Today, I went out to feed again and he's still acting "off". He's does not appear to be dehydrated, but he's been in a turnout with a few other horses so I can't really gauge his consumption. Bowl sounds seem decreased today, but still no other signs of colic. He's still trying to eat, but having obvious difficulties. Looked at his teeth, nothing appears inflamed, no foul smell, no nasal discharge, no visual signs of swelling in his cheeks, however, it does appear that his glands in his neck are somewhat swollen. I separated him from the other horses so I can see what he's taking in. Gave him PCN and plan to make a trip to the vet tomorrow. He's due for a teeth floating, but this came on so suddenly, it has to be something more than just a floating issue. My first thought was an abcess, but none of the tell-tale signs are there for that either.
His eye's are bright, but he was shaking while trying to eat. Shaking decreases substantially when he's walked and not trying to consume.
Any ideas? This one's got me stumped!