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Only if your vet approves it. Colostrum is concentrated cow's milk protein, and protein brings phosphorus, the mineral a renal diet is built to limit. We found no study of colostrum in dogs with chronic kidney disease (CKD), so long-term safety in these dogs is unknown, and nothing suggests it helps the kidneys.
Why is colostrum a concern for dogs with CKD?
Kidney diets are built around a few targets, and the two that matter for a protein supplement are phosphorus and protein.
- Phosphorus. The 2026 International Renal Interest Society (IRIS) recommendations for dogs say that keeping blood phosphate below 4.6 mg/dl (but above 2.7 mg/dl) is beneficial in CKD. The first step is dietary phosphate restriction with a clinical kidney diet, with phosphate binders added if diet alone is not enough. IRIS advises considering a renal diet at stage 2 and feeding one at stage 3.
- Protein. VCA Animal Hospitals explains that phosphorus content in the diet is linked to protein content (opens in a new tab), and that restricting protein is not always necessary but helps ease signs of uremia. Dogs that lose protein in the urine (proteinuria) have extra diet and medication targets.
Colostrum is mostly protein: antibodies, lactoferrin and other milk proteins, and like other dairy it contains phosphorus. Four Leaf Rover, like every colostrum brand we compared, does not state protein or phosphorus per serving, so neither you nor your vet can work out its contribution from the label.
IRIS's CKD treatment recommendations (opens in a new tab) also stress that treatment has to be tailored to the individual dog. A supplement that is fine for one dog at stage 1 may not fit another at stage 3.
Is a daily scoop small enough not to matter?
Possibly, for some dogs. The current Four Leaf Rover label gives 1/8 teaspoon a day for dogs of 1 to 30 lb, rising to 3/4 teaspoon for dogs over 90 lb, at 1.97 g per teaspoon (follow the chart on your own jar, since charts have changed between label versions). For a small dog that is a minor share of daily protein; a large dog on 1/2 to 3/4 teaspoon gets four to six times as much. CKD diets are calculated, though, and an unmeasured extra is still unmeasured. Some vets will accept a small daily amount in an early-stage dog with good bloodwork. Others will say no, especially at later stages. These are the questions that decide it:
| Question for your vet | Why it matters |
|---|---|
| What IRIS stage is my dog? | Diet targets get stricter as CKD progresses |
| Is phosphate at target on the current diet? | If it is borderline, any extra protein source is harder to justify |
| Does my dog have proteinuria? | Protein intake and medications are managed more tightly |
| Is my dog eating the renal diet well? | A powder that puts the dog off its diet does more harm than good |
| Is there a better use of a supplement slot? | Your vet may prefer omega-3s or other options in the kidney plan |
Increased thirst or urination, weight or muscle loss, vomiting, bad breath or mouth ulcers mean the kidney plan itself needs a review, supplement or not.
How to give it long term if your vet agrees
- Show your vet the jar and the amount you plan to give, and have it noted in the record.
- Start at half the label amount or less, and stay at the lowest amount you plan to use.
- Keep the renal diet unchanged. No other toppers or treats at the same time.
- Mention it at every bloodwork recheck, so phosphate and other changes are read with it in mind.
- Stop if your vet asks, if appetite drops, or if vomiting or diarrhea start.
Dog trials on bovine colostrum are few and small. The largest trial and the main 2025 review (opens in a new tab) come from Nestle Purina researchers and measured gut immune markers and vaccine response in healthy dogs. The only data in older dogs is a 3-week pilot in 8 adult Beagles averaging about 8 years old. Nobody has run a long-term trial, or any trial in dogs with kidney disease. If your CKD dog also has allergies or a sensitive gut, colostrum is a fair question for the vet as gut or immune support, never as kidney care. For healthy dogs, see is colostrum safe for daily long-term use.
For owners whose vet has approved it, a single-ingredient powder is the easiest to account for in a diet plan and the easiest to stop. Four Leaf Rover is one; it does not list protein, phosphorus or IgG content. More in the full review and colostrum for dogs.
Four Leaf Rover Bovine Colostrum
by Four Leaf Rover
Dogs- Form
- Unflavored powder, 1.04 oz (29.5 g) jar; 1 tsp = 1.97 g
- Key actives
- 100% New Zealand bovine colostrum (label: no inactive ingredients); IgG % not stated
- Best for
- Raw/fresh-fed dogs and owners who want a single-ingredient, ethically sourced colostrum
- Watch for
- Small jar (about 15 teaspoons); no stated IgG %; bovine dairy proteins; label says safety in pregnant or breeding animals is not proven
FAQ
Does colostrum help dogs with kidney disease?
There is no evidence that it does. We found no published study of colostrum in dogs with kidney disease, and it should not be used as a kidney treatment.
Can I use colostrum as a topper to get my CKD dog to eat its renal diet?
Not without asking first. It adds protein the diet was not calculated for, and appetite loss in a kidney dog is something your vet can treat directly.
Can a dog with kidney disease take colostrum long term?
Only if your vet agrees after looking at the stage, bloodwork and diet. If they do, the amount should be included in the diet plan and rechecked at each bloodwork visit.
Is fish oil a better supplement for a dog with kidney disease?
Omega-3 fatty acids are often already part of veterinary kidney diets, so ask your vet before adding fish oil separately. It is a more common kidney-plan supplement than colostrum, but the dose has to fit the diet.