If it's not genetic, than what is it? Do wolves stop regurgitating food once there are in captivity? Do dingos stop it? Why do other dog owners report regurgitating? And by the way, the book from Elizabeth Marshall Thomas was translated from english into german, and I provided the original title, which you obviously failed to notice. You are the one who makes dubius claims and what are these claims based on? And if a source is not good enough for you because it's written in german, than you should also get rid of for instances the italian sources in the article on the italian wolf. And the dingo is a domestic dog? Here is again the whole not researching topic. You say it is not a domestic dog because it's classified as a different subspecies? What is that classification based on? And in fact, that seems not to be the name with the widest use, that's probably still canis familiaris dingo. And some even use the name canis lupus familiaris dingo or Canis lupus forma familiaris dingo, google them if you think you can get yourself to do that. Check the books of Helmut Hemmer if you don't believe that the dingo shows the same features which are regarded as being caused by domestication and which are also present in other domestic dogs. And the degeneration statement was made source 1-10 (except 7). I'm done with you, and by the way, once you eradicate the sentence, I will readd them, over and over again, as often as necesarry and that's a promise.