assist feeding is mostly for hatchlings that won't feed on their own. humans have a core temp that is maintain by a big part of our calorie intake. snakes don't have this problem, they get their body temp from other sources. so you can't expect them to feed like your dog or cat. when a snake is off feed it's ok for it to lose some weight. but it's not ok for your snake to continue to lose weight. If one continues to lose weight it's not a reason to stuff a rodent in it's month, but if you have good husbandry and a snake continues to lose weight, this is a good sign to take it to the vets. I have a snake that haven't eaten in over 10 months. if you walk in my snake room you couldn't pick him out, he's maintaining a good body weight.