The Blue Lacy is medium in size with a light, balanced yet powerful build. Correct Lacy movement alludes to great speed, strength and dexterity. Its coat is short and sleek. There are three permissible color varieties. Blues are any shade of gray from light silver to dark charcoal. Reds range from light cream to rust. The tri combines these colors with a blue base and distinct red markings as appropriate for trim. White can appear on the chest, stomach and paws. Both the red and tricolored Lacys hold the name Blue Lacy due to the blue-color gene they possess. All Blue Lacys eyes are very bright and distinctive orange to yellow in color, which adds a unique touch to their appearance.

Blue Lacy Dogs in general are intelligent, intense, active, and alert. Developed to be both hunting and herding dogs, they display great drive and determination to work with big game and control difficult livestock. Young dogs may have too much energy and drive for small children. They are easy to train, learning new skills quickly.