Abstract: An adjustable harness for an animal with a girth strap comprising a support base with a guide D-ring. A right and a left shoulder strap pass through the D-ring forming a double layer strap ending in a leash attachment. The shoulder straps pass proximally over the shoulders of the animal down the chest and through a sternum slide having two top slots and one bottom slot. The shoulder straps enter through the top slots and exit through the bottom slot, forming a second double layer strap, which is joined to the girth strap at the center of the belly. The girth strap is adjustable. The effective working length of the shoulder straps are adjustable through a slide stop on the first double layer strap. The shoulder straps are slid through the sternum slide to place the slide at the center of the chest, below the trachea. This adjustability is especially useful for lithe animals such as cats, ferrets, rabbits and dogs.