IMO. i think that it is bs, i have dealt with big pythons most if not all my life, and have never had any thing like that even happen or have even thought about it the only time i have had snakes not eat was because of breeding or something else but have never had one of my retics in my bed at night , and if it were to size her up it would be doing it even in the cage not just in here bed,,and also think that the vet might be a little loony,,, but that just imo