He hit the road all summer with the couple in their Jeep, says Hamazaki.
"He's been busy exploring, fishing, hiking, swimming, camping and digging up gopher holes to keep fit," she says.
The old dog has even learned some new tricks in his new life, including sitting and staying for his dinner and how to roll over - which he does with zeal because it will earn him a belly rub.
Hamazaki says she's noticed a huge difference since Biggie was plucked from the shelter, a true measure of how resilient rescue pups can be.
"He's doing great and we're all very happy," she says.