Malone has the same thing with double-teeth. The incisors (SP?) on the bottom are fine and grown in full size. But the ones on the top have grown in side-by-side, the new ones are full size, and the old ones aren't even loose! Also, the gums around his front teeth are perpetually bright red, like they are inflamed. I am waiting a few more days, and if they aren't better I think I will call the vet.