In the ending of the movie, when the dogs are asking their owners if Angel can stay with them. The husband says "OK Angel, you can stay" How did he know the dog's name when she didn't have any identification on her?
Because when Angel comes up, I think it's Darling that says something like, "Oh, what a sweet little angel." And then Junior's all like "angel" or something, so Jim Dear says, "alright angel, you can stay." just cuz his wife called the dog an angel. It's just...luck I guess. But that's why he says it.
Darling Say, "oh Jim dear what a sweet little angel" and junior says "ANGEL ANGEL!" and by the way it's not a slip-up she was called angel throughout the movie because that's what they had planned on naming her in the end.