Kodie gets one or two a week.depends on how good he's behaving ,i've heard that too but all the dgos that i've had had never had trouble with rawhides,and they took the time to chew it,not swollow them whole.
personally i dont think its true,but on all the bones that Kodies gets,theres a warning on the back that says something like "this is not intended for food,if fed too many it may cause gastric something" i dont totally remember but it does say something onthe label.