The judge also ordered Wetzel to serve probation for four years and pay $32,300 in restitution to the Pennsylvania Society for the Prevention of Cruelty to Animals.
She also can't have pets for 15 years, Simmons ordered.
Wetzel, a widow with no children, earned her nickname from weary neighbors who complained about animal odors wafting from her home. She told the judge that she never harmed any of the animals.
Evidence from her case paints a different picture. PSPCA officers entered her two-story home on Sept. 30 after receiving a tip on the agency's hot line.
In addition to finding a filthy brood of 12 cats and nine dogs, the officers discovered the skeletal remains of four other animals, two of them under Wetzel's bed.
It took the officers two hours to clear a path through ceiling-high debris to reach the animals.
Wetzel took in strays as she found them, said Scott Sigman, her defense attorney.
"From our opinion, Ms. Wetzel is not a criminal. She cared for the animals like they were her children. Things, obviously, got a little out of hand," he said.