I personally have stretch marks basically all over my body. I have collagen defects on top of a few other skin conditions, so they're pretty easy for me to form with the slightest fluctuation in weight. While I highly doubt this is the case for Pup, we also don't know Pup's family's medical history. I'm not gonna name anything for both the sake of my PL and also so as not to give Pup's prying eyes any ideas, but it also COULD be possible that Pup's body is just more prone to developing stretch marks in different places. I hate to be

for Pup in particular, but one's personal anatomy and physiology are so widely varied that we can't exactly say for sure WHAT it is.