I'm dealing with a senior doxie right now - I think he is senile... but for a dog who eats basically everything, when you have a bad day, you feed whatever you can. I was feeding him a senior food but he dropped an insane amount of weight. We are dealing with kidney issues as well, but to be honest, we are on the last leg with him so my main concern right now is just getting him through for a bit. Our daughter is home for a week in August, we want him past that date for sure. The kids are so uber attached to him.... I feed him anything he eats - that could be Brodie's normal food or on bad days Deacon's puppy formula. I know it is bad for his kidneys, but he eats it. I buy Costco chicken broth (it's a really good broth!) and also their bone broth and add it to his foods days he is reluctant. I admit to even feeding him canned cat food sometimes. It's basically just whatever you can get into them because the weight loss is so scary! So forget what the reviews say, if Penny and Loki will eat it - it's a 10 in my book!