An initial X-ray found a screw lodged inside Jupiter's stomach - potentially deadly if, like some, the screw contained zinc.
At the very least, the errant object could cause untold carnage to Jupiter's digestive tract.
But a subsequent probe found no sign of the screw, suggesting it might have tumbled into his intestines.
Somewhere along the way, however, the group found Jupiter's spirit, which apparently hadn't completely checked out.
Brooks says Jupiter is friendly with humans and other dogs. And, most importantly, he's now in stable condition.
Today, all eyes are on his bathroom breaks.
"Luckily it is a small screw and he is a big dog," Brooks said.
Unluckily, a small screw isn't the easiest thing to find in a heap of Great Dane droppings.
"For now it is a wait, watch and see," Brooks says. "We're on poop control now."
It took too long for Jupiter to find the love he needed. But he's finally in the right hands. You can help give him the medical attention he needs by making a donation here.
It may be months before Jupiter is available for adoption, but you can get updates on his condition by following Marley's Mutts on Facebook.