I have a 2 yr old staffordshire bull terrier, I got her as a rescue 3 months ago. The previous owner couldn't home her but had bred her excessively. I also have a male labrador and 5 children. Up until now the staffy has been fine but last night when my son was petting the labrador she went and started snapping at the other dog, today my daughter got down to stroke the staffy and the dog went for my daughters face leaving a visible bite mark but fortunately no blood. The staff hasn't been spayed and had her season in December. I am trying to understand why she has become so snappy over the last 7 days. In general she is very well manered, behaves herself and is a pleasure to have at home. Very affectionate and loving, can anybody help? As I don't want to have her destroyed but at the same time I am reluctant to put my family at risk from being bitten.