BOISE, Idaho (AP) — Federal officials say a wolf killed a border collie herding sheep in the Boise foothills.

Todd Grimm of the U.S. Department of Agriculture's Wildlife Services says the attack occurred May 8 in the Upper Hulls Gulch area as the dog helped herd sheep to the Boise National Forest.

Grimm tells the Idaho Statesman that bite marks indicate a wolf kill.

Frank Shirts owned the border collie named Teson that he says was valued at $500.

Grimm says Wildlife Services used helicopters to search for wolves in the area but didn't find any. He says there are likely individual wolves roaming the area rather than a pack.

But sheep herders say they've heard several wolves howling and seen at least four wolves and pups.

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Information from: Idaho Statesman, www.idahostatesman.com