Cheryl Ann Magnotta had been charged with 21 counts of animal cruelty and 44 counts of scattering rubbish.
A real estate agent found two of the dead dogs June 12 on the foreclosed property. Authorities say they searched the property and found the remains of the other dogs under tarps and rugs, and in kennels, boarded-up buildings and shallow graves.
Police say Magnotta had a registered kennel license as recently as 2001.
Magnotta pleaded guilty Thursday. She is scheduled to be sentenced Jan. 24.
