PITTSBURGH (AP) — Officials say a raccoon killed by a dog in western Pennsylvania has tested positive for rabies.

The Allegheny County health department says the raccoon was killed by a dog in Plum. The dead animal was brought to a county facility last weekend and tested positive for rabies. The dog was up-to-date on its rabies vaccinations.

This is the sixth rabid animal reported in Allegheny County this year; there have been three raccoons and three bats. County residents are being warned to avoid stray animals and wildlife, even if the animals appear healthy. They should also have their pets vaccinated and watch for unusual behavior.

Rabies is a virus transmitted by an animal bite or scratch, and such exposures are almost always fatal when left untreated.