The Michigan Humane Society said Tuesday their investigation indicates that more than a dozen animals at a farm in Detroit weren't killed by a human.

MHS veterinarians who examined the remains of five goats, eight chickens and a cat said their injuries were consistent with dog bites.

The animals were found dead May 31 at a farm on the property of Catherine Ferguson Academy. The farm and animals were cared for by students.

MHS said they weren't sure if the attacks were made by a single dog or multiple dogs.

In the meantime, several animal groups have contacted the school about donating new animals for the farm.

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