Our miniature poodle did bloat a couple of times. We changed him to a grain free diet and it never happened again. It is very disturbing to see his his abdomen swell up like that so quickly. Luckily the vets said because he was small, torsion was unlikely.
It's good to know the signs of bloat as well as torsion. When my mini bloated, I recognized the signs but because he was small, I doubted myself, and what I knew. Later when talking to the vet, she said she would have been confused as well because they dont usually see small dogs bloat. Of course I would get the one bloating mini! BTW he was never a gassy dog.