Columns: No in. series | No in. season | Title | Original air date | Production Code | U.S. viewers (millions)
21 | 1 | "A Doomed Christmas" | December10,2011 | 121 | N/A | 22 | 2 | "Big Dog on Campus / Dog's Best Friend" | January16,2012 | 122 | N/A | 23 | 3 | "Monkey Business / Diary of a Mad Cat" | April21,2012 | 125 | N/A | 24 | 4 | "Dudley Do-Wrong / Puppy Unplugged" | May6,2012 | 123 | N/A | 25 | 5 | "Freaky Spy Day / Dog Tired" | May 13, 2012 | 202 | N/A | 26 | 6 | "Top Dog / Quack in the Box" | May20,2012 | 124 | N/A | 27 | 7 | "Lie Like A Dog / Cold Fish" | May27,2012 | 126 | 2.3 | 28 | 8 | "Pup Daddy / Candy Cane-ine" | June 3, 2012 | 201 | N/A | 29 | 9 | "Bark to the Future / Lights, Camera, Quacktion" | October 13, 2012 | 205 | 1.8 | 30 | 10 | "Happy Howl-O-Ween" | October 27, 2012 | 210 | 1.6 | 31 | 11 | "Bark to Nature / Mutts and Bolts" | August 5, 2013 | 213 | 1.9 | 32 | 12 | "Dog House / Time Waits for No Mutt" | August 6, 2013 | 203 | 1.6 | 33 | 13 | "Hush Puppy / Quacky Birthday" | August8,2013 | 209 | 1.8 | 34 | 14 | "Love Bird / Bluff Puppy" | October20,2013 (Nicktoons) | 204 | N/A | 35 | 15 | "Rat Trap / Agent of the Year" | October27,2013 (Nicktoons) | 207 | N/A | 36 | 16 | "Barking Tall / Bad Eggs" | November3,2013 (Nicktoons) | 212 | N/A | 37 | 17 | "Carbon Copies / TUFF Cookies" | November10,2013 (Nicktoons) | 214 | N/A | 39 | 19 | "T.U.F.F. Choices / Sob Story" | TBA (Nicktoons) | 208 | N/A