Jazz could be laid back at times. But he would play Frisbee, till you got tired, without any treats. Wasn't all black, about 3/4 when he was still less than a year.
First day we brought him home, at 14 weeks.
In his prime at @ five years. Best and smartest dog I ever owned. Irreplaceable, sadly he only made it till ten. Developed an autoimmune disease of the spine and lost the use of his hind legs. Inoperable condition. Tried to play up till his last day.
With his buddy Max, a few weeks after we brought him home. Jazz was Max's replacement. Max had developed a inoperable tumor on his bowel, after we had one removed from his front shoulder. Vet gave him @ one month to live. He lasted eight more months. Long enough to teach Jazz the ropes. We lived in Detroit, back then, and never had a break in. Cindy would walk at 5 AM , every morning with Jazz, off leash. I left for work, she didn't start till 8 AM. Never was accosted.