You know , that's a good question. I always wondered the same thing, but never bothered to look it up. I figured it was unlikely they studied this in dogs (i know they have with narcolepcy though.) Yet i just looked it up and there were plenty of results.

http://sleepdisorders.about.com/cs/s...lkingdom_4.htm
"Another sleep disorder common to both dogs and humans is sleep apnea."

No idea about getting a machine for a dog though. I imagine they'd be hard to get ahold of. (or maybe not... they've been doing it since 1979 in Aus.)

Your dogs' snoring may or may not be normal. *shrug* Perhaps you can get a recording of it and check with the vet.