Antonio was formally an agent at Shelters 34, 46, 3, 54 and 55 before being transferred to Shelter 17 by Dolly. He has a reputation of getting romantically involved with all of the female Pound Puppy agents that he works with. While working at Shelter 17, he sweet-talked both Cookie and Strudel, causing them to fight with each other. Fortunately, Antonio was able to get them to be friends again, and ended up sweet-talking two female guard dogs, allowing Pupster to get inside a gated community and to his human family.
Antonio is currently residing in Caracas, Venezuela, where he is using his sweet-talking charms for good.