donner!
is it possible you are a catahoula leopard? you look alot like one. i know that catahoulas, especially with white on them, are prone to deafness. i know one that was trained to be an airport dog.
no matter what you are though, i'm sure both you and your brother in for a very special life.
lots of catahoula hugs and kisses
jebsmom, jeb and monty