Such efforts are called \"referential communication.”So if dogs behave this way, you might expect the same from their close relatives: wolves. Since the dogs and wolves were all raised the same way and by the same people, domestication must be responsible for the behavior. Pet cats respond more like wolves than like dogs. They need to communicate with their conspecifics to be able to live.”Which is why the researchers decided to compare pet dogs with pet pigs. Pigs have been domesticated mostly for being a meat resource.”It was only later that we started treating some pigs as pets.