If your girlfriend says you are a mangy dog, you can answer in the following way:

Humorous response: "Haha, I It’s a mangy dog ​​who relies on you, the sweetest candy.”

Expressing love: “Because I love you, just like a mangy dog ​​is loyal to its owner.”

Self-deprecating. For a moment: "It seems that I have to improve a lot, and strive to change from a mangy dog ​​to a well-behaved dog."

Retort and tease: "A mangy dog? So do you like me, a mangy dog?"

Change the subject: "Oh, look what's so fun over there! Let's not discuss whether I'm a mangy dog ​​or not."