I’d get the food that the pup was weaned on and then start transitioning a short while later after she gets acclimated to her new environment. Sometimes the stress of going to a new home and a whole new routine is enough to stress them out and give them GI issues and you won’t know if it’s the new food or just stress. Get some probiotics and start her on that to help strengthen her gut/immune system before changing foods. You might also want to get a colostrum supplement. I thought my dogs did fine with regular foods but noticed improvement when I introduced grain free foods and even had more improvement with grain free/potato free foods. They are now odor free/yeast free/ear infection free (which alot of pugs are prone to). I feed anywhere from 30% protein to 60% in kibble and also feed raw, and canned foods and freeze dried foods. Just find a couple foods that work well for her and switch it up every now and then. You can even rotate with every feed.
19 hours, 54 minutes ago
