they say it is possible, they label it a genetic mutation and it can be full bredThat is definitely a brindle pattern. Do you have a pedigree? Where did you get him? As far as I know, brindle can't make a come back. It was a dominant gene that was bred out of the breed.
Those DNA tests are nowhere near 99% accurate, just a head's up.i dont have a pedigree, all i have is a dna test that is 99 percent accurate that says he only has german shepherd in him his dad is registered but not his mom