Two of my Scottie?s had bladder struvites , both had ops, couldn't believe the amount of stones that came out, a bowlful! They were both put on Hills, can't remember which one (it was more than twenty five years ago). There wasn't anything else suggested in the way of cranberry. They both eventually died of kidney disease, which I wonder if it was related.
I wonder if Dorward Herbs would have cranberry for dogs, they do lots of other things for dogs.
Best wishes to you and Maisie.
Lesley and Dylan