Our dogs speak what?

While encouraging my girls to clean their room (with a timer and a garbage bag) I heard the dogs going crazy barking in the living room.

This is the conversation that followed:

Me: "Oh, my. What are they barking at?!"

Jorja: "Don't ask me, I don't speak dog Spanish."

Jonah: "Dog Spanish?"

Jorja: "Or dog English...or whatever. I don't know what they are saying."

I had no idea our dogs were bilingual.