I am pretty sure my dog has sleep apnea.?

I have tried using a CPAP machine on him, but when i wake up he is always just chewing on the mask. i tried adding paper to the sides to make it more for a snout and not for a nose. How can i get him to understand this is best for him and not a really expensive chew toy. also he snores and I have considered putting him down if he snores again. Thank you.