At one time, they were giving Cosequin, for bladder issues, but no more, I forget why now. The last time Prowler had bladder issues, back in May, I asked about it, she said they no longer give it. My vet is beyond, on top of new procedures, medicines, etc. She even attends vet conferences, you guys should ask your vettys, if they do, and if not, why not.
You can get Cosequin from your vet, it is $9. You used to be able to get it at Petsmart, but now they only sell the GNC crap, which I won't touch. I would check Petco or Pet Supplies Plus.
Yes, baby foodies, given un diluted, will cause diarea. I forgot Bump's foodies at one hotel, all I had was a jar of baby foodies, yup, had diarea, got yelled at, mol, for forgetting his foodies, I never forgot again, first thing I pack, to go to the hotel. We give a few licks, of baby foodies, as treaties, at shows. Gave Cowboy too many, he had diarea Sun morn at the hotel, had to wash his back end in the hotel sink, called my vet, she told me what to give him, and got yelled at again, for giving too many lickys, mol, mol, mol.
The key, is to only give 1 teaspoon, and mix it with water, so its like a broth, no more than twice a day, unless told different, by your vetty. This is what Bump gets, never had a prob.
What balance of C/D? If you mean the urine concentration, the only way to tell, for sure, if you need to adjust it, is to have an urinealyasis done.