I used to work as a veterinary technician and I recall having to assist with a spay on a very obese dog... The vet was trying to close her up, but the suture material was slicing right through the fat and couldn't hold it together. The vet needed to change his gloves 3 times during the surgery because all the fat was making them greasy as hell and it was impossible for him to work. I couldn't even imagine having to do that on a "human"