I know I have gotten all of my snakes so far to take F/T but there are a couple that need time alone to eat . It takes them a while to figure it out . We usually put them in a lg zip lock bag then run it under hot water a leave it to thaw out in a shoebox size tub . If the water cools I run new hot water . When the belly is soft It is then offered to the snake who sometimes take a minute or two to strike . If water got in the bag or the rodent is not hot enough I will use the blow dryer . I have one snake that takes about 45 min to figure it out but I just leave her alone and she does . Just be patient it will work .