My last dog had bloat when he was 5, strange that your dog would bloat at such a young age. It took him a while to get over the surgery, and dogs can bloat after they have had the surgery they just can't twist. As I was told it is the twisting of the stomach that kills them. You dog is lucky you noticed what was going on, it only takes hours to kill a dog. If you want any more info on what my dog went through private message me.
A man who looks into a collie's eye to receive an icy stare is but a fool. Be at one with man's best friend and through his eyes you will see his very soul.