Chronic Kidney Disease: Trusted Resources and References

Chronic kidney disease is one of the most common diagnoses in older cats and a frequent one in older dogs, and it generates an enormous amount of online advice of wildly varying quality. This guide points to the sources that veterinarians themselves use, explains what each one is actually good for, and gives you enough of the underlying framework to read them productively.

Use this alongside your own veterinarian rather than instead of them. The value of understanding the guidelines is that it makes you a better participant in the conversation — not that it lets you stage and treat your pet at home.

Start Here: IRIS Staging

The International Renal Interest Society (IRIS) publishes the staging system that essentially all of veterinary nephrology uses. If you learn one thing about your pet's kidney disease, learn their IRIS stage — it determines the treatment recommendations, the monitoring interval, and the prognosis conversation.

The system works in two steps. First, a stage from 1 to 4 is assigned based on blood creatinine, with SDMA used as a supporting marker, measured on a stable, well-hydrated patient — never on a single value from a dehydrated or acutely ill animal. Then two substages are applied: one for proteinuria (measured by urine protein-to-creatinine ratio) and one for blood pressure. Those substages matter a great deal, because proteinuria and hypertension are both independently associated with faster progression and both are treatable.

The IRIS guidelines are freely available at iris-kidney.com, including the staging tables and stage-by-stage treatment recommendations. They are written for veterinarians, but the staging tables are readable by anyone.

Two points that come up constantly and are worth knowing. SDMA rises earlier in the disease than creatinine and is less affected by muscle mass, which makes it useful in thin older cats whose creatinine can look deceptively normal — but it is a supporting marker, not a standalone diagnosis. And urine specific gravity matters as much as the blood values: kidneys lose the ability to concentrate urine before blood markers move, so dilute urine in the face of dehydration is an early signal.

Consensus Statements Worth Reading

The American College of Veterinary Internal Medicine (ACVIM) publishes consensus statements that represent the position of assembled specialists on contested clinical questions. They are peer-reviewed, freely accessible in the Journal of Veterinary Internal Medicine, and they are the closest thing the field has to a settled answer.

The most relevant ones for kidney disease cover the assessment and management of proteinuria, and the identification, evaluation, and management of systemic hypertension in dogs and cats. Both directly address the substages above, and both explain the reasoning behind treatment thresholds — which is useful when you want to understand why your veterinarian is or is not recommending medication at a given value.

The American Animal Hospital Association (AAHA) and the World Small Animal Veterinary Association (WSAVA) both publish practical guidelines, and WSAVA's global nutrition resources are particularly useful for evaluating diet claims.

Professional Organizations

American Veterinary Medical Association (AVMA) — the profession's primary body in the United States, with a substantial library of owner-facing material written by veterinarians.

American Association of Feline Practitioners (AAFP) — feline-specific practice guidelines. Since chronic kidney disease is disproportionately a feline problem, the AAFP's senior care and feline-friendly handling guidelines are directly relevant. They also run the Cat Friendly Practice certification, which is a genuinely useful thing to look for when choosing a clinic.

European Society of Veterinary Nephrology and Urology (ESVNU) and the European College of Veterinary Internal Medicine (ECVIM) — the European counterparts, with congress proceedings that are often freely available and frequently ahead of the textbooks.

British Small Animal Veterinary Association (BSAVA) — publishes widely used clinical manuals; the nephrology and urology volume is a standard reference.

Veterinary Blood Pressure Society — focused specifically on the measurement and interpretation of blood pressure in animals, which is directly relevant to the hypertension substage and is a genuinely technique-sensitive measurement.

Research and Funding Bodies

Morris Animal Foundation funds a large volume of companion animal health research and publishes accessible summaries of what it funds. EveryCat Health Foundation (formerly the Winn Feline Foundation) funds feline-specific research and has supported a considerable amount of the work on feline kidney disease; their summaries are written for a general audience and are reliable.

On the human side, the American Society of Nephrology (ASN), the International Society of Nephrology (ISN), and the European Renal Association are relevant mainly because a good deal of veterinary nephrology draws on human research. Be careful with direct translation, though — cats in particular differ meaningfully from humans in kidney physiology and drug handling, and human protocols do not map cleanly.

Practitioner Resources

Veterinary Information Network (VIN) is the main professional discussion and reference platform for practicing veterinarians. The main site is subscription-only, but its public-facing arm, VeterinaryPartner, publishes owner-facing articles written and reviewed by veterinarians and is one of the more reliable free sources available.

The Merck Veterinary Manual is freely available online and is the standard general reference. It is written at a clinical level, which makes it dense but accurate.

For primary literature, PubMed indexes the veterinary journals. The Journal of Veterinary Internal Medicine is fully open access, which makes it the most practical starting point for an owner who wants to read source material.

How to Evaluate What You Find

Kidney disease attracts a lot of confident misinformation, much of it well-intentioned. A few filters help.

Check whether the source is selling the solution. A site that diagnoses a problem and sells the supplement that fixes it has an obvious conflict.

Prefer sources that cite specific studies and that distinguish between what is established and what is plausible. Good clinical writing is comfortable saying the evidence is limited.

Be cautious with anything promising to reverse or cure kidney disease. Chronic kidney disease involves permanent loss of functional nephrons; they do not regenerate. Good management slows progression, treats complications, and can preserve quality of life for years — which is a real and worthwhile outcome, and a different claim from a cure.

Treat forums and social media groups as emotional support rather than clinical guidance. They are genuinely valuable for that, and owners in them frequently know practical things veterinarians do not — how to make subcutaneous fluids easier, which foods a picky renal cat actually eats. But dosing and treatment decisions belong with your veterinarian, who knows your pet's stage, substages, concurrent disease, and full medication list.

Be careful with dates. The management of feline kidney disease has changed substantially — the introduction of SDMA, the increasing recognition of hypertension and proteinuria as treatable drivers, and revisions to phosphorus targets have all shifted practice. Advice from a decade ago may be confidently wrong.

Questions Worth Bringing to Your Appointment

What IRIS stage is my pet, and what are the proteinuria and blood pressure substages? What were the actual creatinine, SDMA, phosphorus, and urine specific gravity values, and can I have a copy? Has blood pressure been measured, and has urine been cultured — infection is common and easily missed? What is the phosphorus target for this stage, and are we meeting it? Is a renal diet appropriate now, and if my pet refuses it, what is the next best option? What would make you change the plan, and when should I be worried between visits?

Ask for your records. You are entitled to them, and having the actual numbers over time turns you into a far more effective advocate — trends matter more than any single value, and you are the one who will notice them first.