GRESHAM, Ore. - Gresham Police say a 20-year-old man has been arrested after investigators found photographs on the Internet of him sexually abusing his dog.

GRESHAM, Ore. — Gresham Police say a 20-year-old man has been arrested after investigators found photographs on the Internet of him sexually abusing his dog.

According to police, Brandon Vongthongthrip was arrested Thursday for sexual assault of an animal and aggravated animal abuse.

Police say Vongthongthrip assaulted his 8-year-old pit bull hundreds of times. Police say the abuse occurred over a five-year period.

Vongthongthrip lives in Gresham with his mother and her fiance. Multnomah County Animal Control says the dog was removed from the residence and will receive an examination and treatment.

Authorities say Vongthongthrip was lodged at the Multnomah County Detention Center on $1.5 million bail.