A Nuttall's cottontail---its small tail has white on it.
The Nuttall's cottontail averages 14 inches in length, is gray or brownish-gray, and has a relatively short, inconspicuous white tail. It is found in sagebrush areas, weed and tall-grass patches, and orchards throughout eastern Washington. Compare with the pygmy rabbit which is smaller (10 to 12 inches in length) and does NOT have a white tail.