Primary Source

Currier & Ives, The Old Bull Dog on the Right Track, 1864 (The Gilder Lehrman Institute of American History)
McClellan: “Uncle Abraham don’t you think you had better call the old dog off now, I’m afraid he’ll hurt those other dogs, if he catches hold of them”
Lincoln: “Why little Mac thats the same pack of curs, that chased you aboard of the Gunboat two years ago, they are pretty nearly used up now & I think its best to give the old bull dog full swing to go in and finish them!"
Davis: “You aint got this kennel yet old fellow!”
Grant: “I’m bound to take it"