I'm a little worried because my 12 year old gelding seems to be bothered whenever I touch his left side. When I go to pet him or approach him from the right he is fine, normal, happy, behavior, but when I go to his left side he pins his ears and acts very annoyed. I've never seen him react so strongly. The other day he wouldn't even let me mount up. He's walking fine and doesn't seem to be in pain. Any suggestions or any ideas to what this is?
Thanks for the help