Meet the Beast Beast is an AKC Registered Boxer. SEALED BRINDLE: is the MOST rare color. They are a black boxer. It is where the typical black stripes are "sealed shut" and therefore you can see pretty much no fawn on their body whatsoever - they appear completely black in color. They often have the same white markings as any other boxer, but simply have pretty much no fawn color - only black and most likely some white. Black Boxers are considered a Sealed Brindle by some and a reverse brindle by others and are registered as brindle boxers with the AKC.