Chin chewing other chin



Okay so I had to separate my chins due to health issues. I finally was able to get them back together and one of the chins is chewing the other ones tail, the other chin doesn't even seem to mind the chewing, and they both seem a lot happier being with each other. Is there any possible way to stop furbiting? I do give them lots of chew toys and hay but he still seems to like the other ones tail.