Detectives are investigating a “horrific” case of animal abuse after two dogs — one with her ear ripped off — were found abandoned outside an animal shelter Monday night.

The two 3-year-old pit bull mixes — who have since been named Vanna and Lily — were found by a security guard outside the Humane Society of Southern Arizona, 3450 N. Kelvin Blvd., between North Dodge Boulevard and North Country Club Road.

Vanna was tied to the shelter’s gate and Lily was found nearby, Samantha Esquivel, spokeswoman for the Humane Society, said in a news release.

“Vanna was covered in dry feces, malnourished and the worst part — Vanna’s entire right ear was completely missing. Her inner ear was fully exposed to debris and infection,” said Esquivel, in what she described as a “horrific” case of abuse. Lily “was covered in feces and incredibly malnourished with bite marks and scars.”

The dogs are receiving veterinary care at the shelter.

The Pima County Sheriff’s Department is investigating, Esquivel said.

Anyone with information should call 88-CRIME. Callers can remain anonymous and a reward may be offered.