The most evidence-backed change is phosphorus restriction — it's the single most important nutritional modification and has been shown to slow the progression of canine kidney disease. Therapeutic renal diets combine moderately restricted phosphorus, protein, and sodium with added omega-3s and potassium, and studies show these diets can roughly double survival time.
Get a straight answer for your dog’s exact situation — or scan their food in seconds.
The essentials. For anything specific to your dog, just ask the assistant above.
This is genuinely controversial. Severe protein restriction is no longer favored, because too little protein causes muscle wasting. The current thinking is a moderate amount of HIGH-QUALITY, highly digestible protein combined with the other modifications — enough to maintain muscle while reducing the protein-waste burden. So it's not 'low protein,' it's 'the right amount of the right protein.' Phosphorus control matters more than aggressive protein cutting.
Damaged kidneys can't clear phosphorus well, so it builds up in the blood, which accelerates further kidney damage and drives the mineral imbalances that make dogs feel sick. Controlling dietary phosphorus is the most proven way to slow that spiral — limiting high-phosphorus ingredients (organ meats, bones, dairy, some fish) and sometimes adding phosphate binders under vet guidance.
For the liver, a well-balanced, energy-rich diet with enough high-quality protein supports healing (severe protein restriction is only needed with hepatic encephalopathy). Milk thistle (silymarin) and SAMe are the two most-used liver-support supplements, with reasonable backing — both are antioxidants that protect liver cells and are generally safe. Honest caveat: they support the liver rather than cure the underlying disease. Both kidney and liver disease need veterinary diagnosis and monitoring.
Educational only — not veterinary advice. Always work with your vet, especially if your dog is on medication.
Ask the Common Sense Dog assistant →