pup designs question

wasnt sure how to simplify my question for a thread title so, sorry for the vagueness!

so, we all pretty much know that wolf pups irl and on this site tend to start off with "markings"/sometimes colors that are different from what their adult appearance will be. what im wondering is if an already-born pup can be adopted out as a basic color (brown, for example) with the option for adopters to make an adult design based on it, going by the fact that pups tend to grow into their adult designs. so the pup would absolutely be brown still regardless of adult design, but they may mature into different markings and additional colors depending on who adopts and designs them.

technically the pup would be born without a set adult design and i know wolf has clear rules on changing character designs, so i wanted to make sure it wouldn't be seen as rule breaking to do this