Continuity mistake: When Charlie and Itchy are escaping from the pound they are trying to dig under the fence. Someone is shooting at them and blows a huge hole in the fence. When the camera cuts to another shot of them going under the fence, the hole is now gone.
Continuity mistake: After Charlie returns to the casino from being busted out, he speaks to Carface and makes a deal. They go to celebrate and give him a gold watch necklace, which originally has a red strap. During the celebration, Charlie is tricked into sitting on a dock for his big "surprise". As Killer is blindfolding him, Charlie brings down his arms and for a few seconds, his strap is blue. After Killer walks away they cut back to Charlie, who is again wearing a red strap instead of blue. (00:12:40)
Answer: Charlie talks to Anne Marie about them so my guess is that he has visited the puppies and the female dog before maybe even a few times.