For your puppy, have you tried adding digestive enzymes to her food? That might help. That said, I’d also recommend changing her food. Poor puppy, can you imagine how miserable she must feel.
When my Golden has gas its because he’s eating something that he’s intolerant of, such as chickpeas or lentils. Look and see if your food includes those. If it does, you might want to look for something without a lot of legumes.
Free feeding isn’t a good idea for a variety of reasons. It contributes to weight gain and isn’t particularly safe as fats in dry dog food go rancid quickly once exposed to air. Everyone should have their place to eat and their own bowls. Give them 15 minutes to eat and then remove what’s left.
Some brands with tiny kibble are Nature’s Logic, Wellness and Amicus. Wellness Core Small Breed is a great product and the kibble are a small, thin, triangular diet of shape. My Cavalier does great on Wellness Core products.
