pedigree??

Question
how do i know if my staffodshire bull terrier is a pedigree without having the papers etc, i have heard if the roof of the mouth is all black then thats a sign or is that rubbish??"!! she looks like other photos of staffies and is it true that the dogs have bigger heads than the bitches?

Answer
Other then an expensive DNA test,there is no way to tell if a dog is purebred,and I have never heard of anything about the colour of the mouth,just depends on the dog,like some people have freckles and some don't

Since males are larger then females,it would stand to reason they also have bigger heads