I cannot see how it is classed as "cruel" for feeding your dog a good quality dried food.
My Harvey was fed Burns Fish and Brown Rice for 11 years and he thrived on it. He had severe allergies and for the first year, before we discovered Burns, he was on a complete home cooked diet. Then when we discovered Burns, he was fed that and he loved it. We added cooked and fresh veg to it, but because of his allergies, it was literally the only thing we could feed him.
We always said that when we got another puppy, we would feed him Burns too - which we are doing with Archie. The breeder had him on Iams Puppy but he was passing terrible wind and his poohs

were huge and he was going five, maybe six times a day and it literally was rubbish he was passing.
Since we weaned him over to the Burns Mini Bites, he is no longer passing wind and is down to two, maybe three small poohs a day. He is putting on the right amount of weight, is not at all overweight and our vet is thrilled with him.
I soak it in a little warm water and Archie absolutely loves it. He does the whole body wag while it is being prepared and his tail wags the whole time he is eating. He does have tiny amounts of carrot too, but apart from that, the Burns is all he has. He doesn't counter surf, greed from the table or scavenge for food on his walks - in fact, the only thing he does chase and look for on his walk is leaves, especially if they blow in front of his face
So, my opinion for what it's worth is if your puppy/dog is happy and healthy on the food it has and you and your vet are happy then continue feeding what you are. It isn't cruel to be fed the same food for years - my Harvey was testament to that
Kirsty and Archie
