BrBr/nBr
Brindle creates an irregular striped pattern all over the body, can be darker than the basecoat or black.
In recessive can cover the 50% of the body, in dominant can cover 100% of the body and add a second layer of striped, lighter or darker than the first layer, but must always be darker than the basecoat!
> A real example <
Here some example of how brindle can be, the stripes must be irregular, chewed, heavily textured and connected, can vary in thickness or be very thin. It's up to you!