We just had a litter of 8 pups and one came out a reverse brindle. The mom is blue and the dad is just a regular brindle.
How Do U Make Reverse Brindle Pitbulls?
You'll need your pedigrees and the first link is some color genetics for you. They generally carry a multitude of color and markings.
http://www.adbadog.com/uploads/pdf%20forms/colorgenetics.pdf
q7351465.html
http://www.adbadog.com/uploads/pdf%20forms/colorgenetics.pdf
q7351465.html