well i gave timmy like MAYBE 10-15 pieces of hard food mixed in with his wet tonite..and he threw up

it was basically the same as before just a little less slimy, and all colored like the food instead of white. Other than that all was the same. I didnt hear him chewing any of the hard pieces..so im not sure if he just gulped them down or what. I still think it may be caused by excess air he cant get out...cuz no burping this feeding. I think i'll google what ingredient(s) in food cause gas in dogs and see if theres somethin i can do there..i dunno. He seems happy now, playing and what not..its so irritating that there are no symptoms and no reasons found for this problem. and obviously he doesnt have the problem with wet food...so to me that means it HAS to do with the actual pieces of food somehow..