The best thing to do is have him looked at by a vet. Dry heaving also sounds like coughing, so it could be something to do with his respitory system.
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~B~
"If you are a dog and your owner suggests that you wear a sweater. . . suggest that he wear a tail."
Bailey (Labradoodle)
Tippy (Collie/ShepX)
Vali (American Bulldog)
Artiro (Cane Corso)
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