If you mix the image of a saddle-worn rancher with the goofy grin of Scooby-Doo, you’d get something close to Cowboy, this week’s Pet of the Week.

The Lawrence Humane Society needs help solving a mystery: Why, oh why, has the perfect dog not been adopted?

Sweet Jasper has become a star on Mass Street and lived it up on campus, but he’s ready — really, really ready — to be part of someone’s everyday routine.

Behavioral staff at the Lawrence Humane Society have spent months gaining sweet and skittish Lulu’s trust, but they say it’s a prize worth winning.

Sammy, a hound-spaniel mix, is a happy-go-lucky pup who is having a hard time keeping his cheer up at the shelter. At his best, he’s eager, calm and cuddly.

Scout, a 2-year-old pitbull mix, loves playing fetch so much she’ll throw the ball in the air for herself to catch.

No kennel bars will hold Ash, a Labrador/Great Pyrenees mix, but that’s OK because he’s a gentle giant who won’t tear up a home if he’s roaming alone.

Axel, a 5-year-old mixed retriever and American Bulldog, thinks he’s a lapdog, and no one is telling him otherwise. His foster parent says he “has been the best boy.”

Bob, a 1-year-old pit bull mix, is “truly as perfect as they come,” according to Lawrence Humane Society staff. He’s a doggy socialite who loves to make new friends.

Luna, a pit bull and Labrador mix, is a friend to all and enemy to none. Not only does she love humans, but she can live with other dogs, cats and children.