Occasionally, for a treat, the slightly-oniony soup should be okay, but as a regular diet, not so much. The risk is that Boopsie could develop hemolytic anemia, and that is definitely something we don't want. Garlic and leeks contain the same problem constituent as do onions, but in lesser quantity. It really comes down to how sensitive Boopsie is, but that's hard to evaluate. It's one of those problems that stays hidden for a time, then jumps out at you. Can you make the soup without the onion?
As far as protein goes, yes, it's not great for the kidneys, but some vets think that the most important thing is to keep the cat eating, even if that means feeding high-protein foods.
I can't remember: has Boopsie been checked for diabetes?
Lastly, the thing I hope wrong (i.e., isn't the problem)... This could be the beginning of an adverse reaction to the thyroid-suppressing medication. If it is, it's important to figure that out quickly because it tends to become something of a juggernaut if not dealt with fairly promptly. The concern would be liver or bone marrow damage. You might talk this over with your vet, or maybe a couple of vets, to get a broader view. I don't know your vet at all, but some are reluctant to consider this possibility. This often is either because they don't like the alternatives to medication or because they don't do thyroid surgery themselves, and don't know anyone to whom they'd feel comfortable referring you. I've had cats older than Boopsie have the surgery with great success, but if you go that route, you want to do it before she's too weakened by weight loss.
Passing thought: Have you tried adding a little catnip to Boopsie's food?
I really admire the love, patience, and skill with which you and Lis care for Boopsie. She's a very lucky kitty to have you, and we're all lucky to have the privilege of loving such a special lady. Hugs to you all, and please let me know if there's anything I can do to help out.
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As far as protein goes, yes, it's not great for the kidneys, but some vets think that the most important thing is to keep the cat eating, even if that means feeding high-protein foods.
I can't remember: has Boopsie been checked for diabetes?
Lastly, the thing I hope wrong (i.e., isn't the problem)... This could be the beginning of an adverse reaction to the thyroid-suppressing medication. If it is, it's important to figure that out quickly because it tends to become something of a juggernaut if not dealt with fairly promptly. The concern would be liver or bone marrow damage. You might talk this over with your vet, or maybe a couple of vets, to get a broader view. I don't know your vet at all, but some are reluctant to consider this possibility. This often is either because they don't like the alternatives to medication or because they don't do thyroid surgery themselves, and don't know anyone to whom they'd feel comfortable referring you. I've had cats older than Boopsie have the surgery with great success, but if you go that route, you want to do it before she's too weakened by weight loss.
Passing thought: Have you tried adding a little catnip to Boopsie's food?
I really admire the love, patience, and skill with which you and Lis care for Boopsie. She's a very lucky kitty to have you, and we're all lucky to have the privilege of loving such a special lady. Hugs to you all, and please let me know if there's anything I can do to help out.
(Edited to clarify the use of the word "wrong".)