Apparently George Washington loved dogs. He even returned one to his British counterpart after the Battle of Germantown. Here is a letter Washington wrote to General William Howe three days after the battle. (The letter was actually written by Alexander Hamilton).
[Perkiomen, Pa.] Octr 6. 1777
General Washington’s compliments to General Howe. He does himself the pleasure to return him a dog, which accidentally fell into his hands, and by the inscription on the Collar appears to belong to General Howe.
HT: Nate McAlister