A 42-year-old Penrose woman may face 64 counts of cruelty to animals, according to the Fremont County Sheriff's Office.
Penny Gingerich has been summonsed to court on the misdemeanors.
Authorities seized 55 of Gingerich's horses on Friday from a property the 1000 block of L Street, according to the Sheriff's Office.
Gingerich had removed nine horses from the property, eight of which were found at a sale barn in the Fort Collins area, according to the Sheriff's Office. The location of one horse - the 64th - remains unknown.
The 63 horses seized by the Sheriff's Office have been taken to a secure holding facility, where they will be cared for until the case is ruled on in court.
Investigators from the Colorado Humane Society and the Denver Dumb Friends League worked with Sheriff's Office deputies Friday.
When a Sheriff's Office pursues legal action in cases of cruelty or neglect, the Colorado Humane Society and SPCA can "help with transportation, food and a safe place to be cared for while the court case outcome is determined," according to a Sheriff's Office news release.
Contact Ellie Mulder: 636-0198