Hi all- horse in question is an 11yo QH/Perch/TB cross. Buckskin, four black legs except for a wee bit of white on the coronary band of one hind.
Has been eating a low NSC hay with ration balancer. Overall diet meets all the minimums of vitamin/minerals, despite the hay being low in Cu and Zn. Hay is also high in Fe, so to cover all bases he's being put on a supplement next week that balances the Fe:Cu:Zn to a 4:1:3 ratio.
When he was about seven he grew a few white stripes on his previously all black hooves. I chalked it up to coronary band injury as he had a few knocks jumping, but was surprised to see them as he had not been lame or had any swelling.
Since then he's continued to grow white stripes, each stripe might come and go, but overall he's looking like he has appaloosa hooves now.
His coat has remained the same.
Any ideas what might be going on? I'm hoping it's normal and that I'm just ignorant due to never having seen such a thing.