This happens to Tae every once in a while. I've noticed it frequently happens after she's been grooming herself, but not sure that's always the reason. If she's been grooming, then my assumption is she's gotten some hair caught in her throat. She'll walk around gagging and such and after 5-10 minutes she's fine. The first time she did this we'd just arrived home from the dog park and I think she'd swallowed something (she probably had something like a tiny piece of pine bark stuck to her tongue). I thought it was gonna make me gag cuz it went on and on. Now I'm used to it,thank gosh!
It's possible something like a doggy hair got caught in Rocco's throat or maybe irritated it. It's also possible he had an empty tummy, which was making him nauseous. I give Tae a small treat before bedtime and first thing in the morning. Otherwise, she's prone to getting sick. This is somewhat common among Boxers and other breeds, I'm sure, since they eat every 12 hours or so. Their tummies get empty and that can make them nauseous.
Taebo -- Flashy Fawn Devil, born 12/02/02, adopted 01/10/04