My thoughts... Instead of feeding the larger sized mice/rats I am going to stick with the rat "hoppers" forever and just feed more in quantity. The reason being... why take the chance of having them bite the snake. I will just feed two hoppers instead of a small/medium rat. But that is just my two cents. Also, think of prekilled f/t. As for the bite, keep an eye out... an overprotective mommy/daddy would to to the vet, which is a good thing! But you can also wait... then again you did say you saw puss... not good.