Hi Donna,
If you think they’re drinking heaps of water then they probably are drinking too much water, when my boy was eating Taste Of The Wild, Sierra Mountain Roasted Lamb he’d drank heaps of water some days then he stopped eating the dry kibble, so he made the dision for me to change dog foods… When your pups grow up & are adults start rotating between a few different brands of kibble with different meat protein, so they aren’t eating the same dry kibble 24/7 & add some fresh whole foods to their diet…..
Have a look at “Canidae” All Life Stages, Large Breed Puppy formula’s, Canidae have 2 large breed puppy formula’s their Turkey & Brown Rice & their Duck, Brown Rice & Lentils large Breed puppy formula..
Here’s Canidae’s site, click on page 5 both formula’s are there, Canidae has heaps better ingredients then the Iams puppy formula…
or look for Large Breed Puppy in “Holistic Select” “4health” “Victor” “Sport Dog Ellite Series”
https://www.canidae.com/dog-food/products
