stopping a rug biter!!

[jojo5]

Hi, can anyone give me their ideas for a product or something I can make up which I can spray onto my turnout rugs so that my horse's field companion is put off trying to bite my boy's bottom and consequently biting holes in my rugs. I thought I could try Cribbox, or someone on the yard has suggested making a spray with mustard powder? The owner of the other horse is aware of his habit and is quite happy for me to do this.
Thanks!

 

[WeeBrown]

A product called yum yum apparently works.....haven't tried it myself though but think it is cheap enough to give it a go.

 

[smerr14]

I use tea tree oil spray by gold label. They don't like the taste of it. I know several breeders put it on the top of mares tails to discourage the foals chewing it.