I don't notice anything like that my Dums. eat like crazy but I do have one that has a strange trait I got her through a rescue her owner who was a woman said she was very aggressive and was scared to handle her so I took her in she is a swwetheart loves to lay on my shoulders and watch tv however you bring a woman around and she goes nuts she will strike and has even chased women around at my place so I can never take her out if a woman is here but guys no problem so weird.