My 1 year old choc. Lab starting having diarrhea for about 2 days and then he began having episodes about 10 minutes apart where it appeared as if he had something stuck in his throat or as if he was wheezing but his stomach was sort of dry heaving....then he would foam terribly at the mouth and this would last for about 10 seconds a piece...then when he quit he perked his ears up and began waggin his tail. He seems fine other than the episodes which happened about 5 times this afternoon...his diarrhea is pretty severe with him squatting about every 15 minutes to shit. Do these sound like familiar symptoms? Thank you for your help.