Can people understand Wishbone?

During the episodes we here Wishbone's voice, and the characters, in the کتابیں at least, seem to react to what he says, but there's no اندازی حرکت of his mouth, and he barks.
So my سوال is, can Wishbone talk so other people can understand him, یا is what we hear is just his thoughts, and he imagines the characters in the کتابیں responding accordingly?