! I'd love the recipe for those treats! I'd love for him to get something other than his cardboard ones, lol.
So, about the amount of food.
When he was eating the Purina Pro Plan, he was getting 4 cups a day. His weight was good. At around 82lbs I believe at the time. But then when he got switched to the prescription diet, his cuppage (is that even a word?) got upped to 4 2/3 cups, per the bag's recommendation. He started losing weight, even at the added food. So I calculated the kcal per cup....
With Purina at 4 cups, he was getting 1716 kcal a day.
Hills Z/d at 4 2/3 cups, he was getting 1663.8 kcal a day
So he was getting more food, but less calories. Granted, it wasn't a huge difference, but apparently for him it was big enough for him to drop in weight. And when I say drop, I mean I noticed not because of a scale, but because I was beginning to feel the bones of his spine on his back which had only happened once before when he was dropping weight and having loose stools with a parasite, and he had tested clear of parasites at this time.
So! We increased his Hills by adding an extra 1/3 cup to make it more equivalent to the amount of calories he was getting when on Purina. This was on July 14th.
5 cups of Hills z/d = 1779 kcal a day. Current weight is steady at 84lbs.
If and when we fully transition to his new regular food (Hills Science Diet: Sensitive Stomach, Chicken and rice) he'll get 4 1/2 cups a day (1764 kcal total).
Yeah. I did a lot of math and calculating this summer! It was said here before that too much food could cause loose stools and I did lessen his Purina intake earlier this summer (he was getting way too much before we went down to 4 cups) but his stools were still loose. Currently he does not have loose stools with his 5 cups a day on his prescription food.. They are like ... the perfect poops! Hopefully this trend will continue when fully on regular kibble. If not, well... we'll try something else. The vet did give us a prescription for Royal Canin too, just in case the Hills z/d didn't work out.
I hope all that made sense!