Dog Run is a 2.31 mi (3.72 km) long 1st order tributary to Buffalo Creek in Washington County, Pennsylvania.

Dog Run rises about 2 miles south of Dunsfort, Pennsylvania, in Washington County and then flows north and northwest to join Buffalo Creek at Dunsfort.

[3] Dog Run drains 1.33 square miles (3.4 km2) of area, receives about 40.2 in/year of precipitation, has a wetness index of 300.49, and is about 78% forested.

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