Well because dogs use their bodies to tell many things to each other and one of them is who is the more dominante pack member. A dog will use it's body to pin another dog into submission so a dog that won't allow this behavior from a pack member is not allowing it due to dominance. This article has a lot of information regarding children and dog bites and there are a few pictures here that show exactly what I'm talking about. These stupid owners allowed a mastiff to completely dominate their baby by getting on top of it and laying on it and took pictures of it. So in the reverse, if they child is on top of the dog, the child is the more dominante pack member.
****WARNING**** There are dog bite pictures in this article and they are all children so be forwarned before you open this link.
http://leerburg.com/kidbites.htm
****WARNING**** There are dog bite pictures in this article and they are all children so be forwarned before you open this link.
http://leerburg.com/kidbites.htm