Swollen knee on horse

Question

My friend's horse that I ride occasionally has started limping on his right fore. This was going on very mildly for 2 weeks, almost at a level where it was unnoticeable for the rider. She gave him a few days off, and it persisted. The knee is a bit warm and swollen.Today, we hosed it with cool water. Obviously we will call a vet if it gets worse or doesn't get better, but what do you all think it is?

He is relatively young, and not worked strenuously.

Answer 1

The horse could have an abscess. If you don't find any sign of an abscess soak it or hose it in cold water and call a vet if there is no improvement.