So I am thinking of rescuing a Presa Canario from the shelter, I am taking him in tonight so I can evaluate his behavior with my family (fiance , chihuahua and cat) we previously owned a seriously Dog agressive Pitbull(no papers) but the pit was able to get along with both the cat and the chi just fine, outside he was crazy.. anyhow, the people that run the shelter showed me his papers and in one of the vet documents they ran a dna test to see what the dog was, and it showed 25% coming from bullmastiff/bulldog and 12.5% from boxer the rest of the DNA is unknown. Has anyone ever done a DNA test on their Presas and also what can I expect from this mixing that I see on his DNA panel? Here is a pic of the dog by the way, he is 11 months old and weights 115.