I am petsitting my friend's horses and am not sure what is going on with him. He is in his early 20's. I went out to clean the stalls and love on the horses when I noticed that Dundee, the pony in question, was walking slower than normal and a lil off in his right hind leg. When he stands, he stretchs out in his hind and front. I have checked for any edemia or swelling and have not found any. I checked his temp which read 99.3, 99.8, and 99.7. I felt his feet and they felt slightly warmer in comparison to his stallmates. His gums return to pink immediately after I remove my finger. He also has good gut sounds. In the 30 years that I have had horses I have never dealt with something like this so I am in awe with what this could be. I am thinking he could have foundered but have never had a founder or have been around one to know for sure if this is what is going on. He definitely looks uncomfortable. He has been pooping. I am unsure how much water he has been drinking too becasue there is one communial water trough for three horses. I have included videos of him so that you can see him. Please any info or comments would be greatly appreciated. I will try to get some pictures of him and maybe a better video.