We've got a fox terrier (but not a toy one) and a Dobe. They have a wonderful relationship. Charlie (my Dobe) absolutely adores Zippy (my partner's fox terrier), and vice-versa. She pushes him around, mostly because he's big and boingy so there's quite a bit of "Grrrr, wotchit, pal, I'm down here!". He will let her do anything with him, and if they're ever apart for any time he's ecstatic to see her again.
She's quite nervous of strange dogs and if we're in the park and Charlie sees her getting nervy about some dog, he trots back and escorts her past the dog.
There's some footage of them together on my Charlie vid here:
YouTube - The Life and Times of Baron Charlie Doberman