Blue is one of the rarer yet popular colors in American Bulldogs. Since it is an ‘exotic’ color, major kennel clubs like the AKC do not include it in the breed’s standard colors.
The blue coloration results from a recessive dilution gene that makes a black coat appear bluish-gray. Being a recessive trait, a puppy needs to inherit this dilution gene from both parents to have the blue coat.
Being one of the rarest colors, a blue American Bulldog puppy from a reputed breeder can cost more than an average puppy, ranging between $1,500-$5,000.