Lauren,
Unless your planning on using him as a stud I am pretty sure using the same methods trainers use for stopping biting could work. Example. Whenever mine would bite I would say no bite or say ouch really loud and ignore them. So maybe you could say Yuck or No or eww and then ignore him. I have found that with Yorkies so far they hate to be ignored. So they will eventually stop whatever they are doing that is causing your attention to not be focused on them.
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Lori, Friday, Olivia, Miranda , Chanel and Casey |