Picture: Wikimedia Commons This is the variation with the pure brindle markings you see on Frenchies. However, the tiger brindle pattern reveals far more defined stripes. Frequent brindle is more of a muddled mixture. Not all Merle Frenchies have these medical problems, but “Double Merles” are in a Substantially better https://frenchbulldogtexas.com/french-bulldog-colors-and-patterns/