While I am glad to see that he is examined regularly and does have blood glucose curves checked, the reason I asked about his diabetic stability is because we can see diabetes secondary to other health issues. The most common is Cushing's disease, a condition where the body produces too much steroid (other less likely issues being hypothyroid, acromegaly, etc). The reason I mention it is because this condition also will cause weight gain and give dogs a pot belly type appearance. Therefore, if this has not been checked for, it may be worth doing so to make sure this isn't playing a role in this ballooning weight gain we are seeing.
That aside, we need to consider what we are feeding in terms of calories and protein with Oz. To start, when we have an overweight dog, we need to use a gradual weight loss plan. Crash diets are no good for any species. Therefore, it will be a case of starting small and then working down our daily calorie ration as we get the weight off. Therefore, if he is currently 61.4lbs, we will do our calculations at that point and then wean down the volume we feed over time as we reduce the weight.
Just to make a wee mention on protein levels to feed, his minimum will be one gram per pound of his weight per day. Therefore, for the moment that is 61.4g daily. This usually is something we stick to or can give a bit more, while we focus on calorie cutting for him. Now in regards ***** ***** calories, what to feed does depend on a few factors (neutering status, activity level, etc). Still, for a 61.4lb dog, we'd feed a base calorie or resting energy requirement (RER) of 888kcal per day. For weight loss, that would be all we'd give but for a neutered adult with normal activity we'd give up to 1430kcal/d (1.6 x RER) and for an unneutered dog with adult normal activity up to 1598kcal/d (1.8 x RER). So, that gives you a range to work with. And since he sounds quite overweight, we may want to stick as close to the RER (so 888kcal) as possible. And if we are using a diet that has 3,377kcal per kilogram that means a daily ration of 262 grams of food per day of this diet. And while cups vary in size and ingredients have varying densities that would work our around 2 cups per day. So, it sounds like you are on the right track there, though I would strongly suggest measuring the food in grams as opposed to using cups so we can just make sure we are keeping to the level we need to be feeding.
Overall, you are on the right track with the recent diet change. Though I would suggest a grams scale be used at home to just make sure. Otherwise, I would note that if he is feeling hungry despite that amount of food, you can soak the kibble to help it be more filling or even add low calorie veggies to his diet (ie carrots, cauliflower, broccoli --but no garlic, onions, raisins, grapes, or raw potato). And of course, exercise is always important from a calorie burning perspective. Finally, just since it sounds like you have been doing everything right only to find him gaining more weight, I would at least advise having a word with his vet about those other hormonal conditions I mentioned to just make sure they are not thwarting you in helping Oz.
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