“She’s a Saint Bernard, English Mastiff, and Presa Canario ” Wow, sounds like a beautiful combo. I love Presa’s and Cane Corso’s in particular for the Mastiff breeds. Its great that you are doing puppy classes since these are some pretty powerful dogs mixed all in one. Excellent family dogs, but need a strong leader.
Fromm Gold Large Breed Puppy is a excellent choice for your XL pup. It is always the first food I recommend as I feed Fromm and love the food and the company.
For your other 2- I think an all life stages food within your budget that is good quality could do the trick. Feed the overweight one for her activity level and target weight (not current weight) and feed the active one for how active she is and make sure she is consuming enough calories to make up for what she burns so she is not loosing weight.
