How I Evaluate a Dog Supplement Now (My Personal Checklist)
Reviewed with our veterinarian —
On this page
Table of Contents
- Why I Made a Checklist
- The Checklist
- Walkthrough: Evaluating a Real Product
- Instant Red Flags
- What I Learned
- Frequently Asked Questions
- References
🔑 Key Takeaways
- My 10-point checklist takes about 15 minutes per product and has saved me hundreds of dollars
- The three most important questions: Is there canine research? Is the dose adequate? Will my dog eat it?
- “Vet recommended” and “made in USA” are marketing terms, not quality indicators
- If a company cannot answer basic questions about their product, that is your answer
Biscuit’s Rating: 🐾🐾🐾🐾🐾 (5/5 — this checklist is why she only takes 3 supplements now instead of 8)
What the research shows
Two ideas anchor how I shop now. The science of biotics has matured, and postbiotics are a formally defined category with canine trials behind them [1][3][4]. And supplement labels are often less accurate than they look [2]. A veterinary review makes the same point about evidence quality [5].
Keep reading: What I Look for in a Dog Supplement Now · I Tried 5 Dog Supplements on Biscuit
After spending approximately $480 on supplements that did not work (see the full list of failures), I finally got organized. I made a checklist. A literal, printable, 10-point checklist that I go through before buying any supplement for Biscuit.
It takes about 15 minutes. It has prevented me from buying at least 5 products I would have otherwise purchased on impulse. It is the single most useful thing I have created for Biscuit’s health management, and I am sharing it here so you can use it too.
This builds on everything I have learned through Biscuit’s digestive journey and what I wish I knew earlier.
Why I Made a Checklist
Because I am impulsive. I see a sad dog in an ad, read “supports digestive health,” and my hand is already reaching for my credit card. The checklist is a speed bump between my emotions and my wallet. It forces me to ask: “Is this actually good, or does it just have good marketing?”
Dr. Huang helped me develop it. She reviewed my questions and added a few I had not thought of. It is not a scientific instrument. It is a practical tool for a non-scientist trying to make better decisions.
The Checklist
Before You Buy: The 10-Point Supplement Evaluation
| # | Question | What to Look For | Pass/Fail |
|---|---|---|---|
| 1 | Does my dog actually need this? | Vet-identified need, not marketing-created anxiety | Must pass |
| 2 | Is there published research? | Peer-reviewed studies, ideally in dogs, with PMIDs | Must pass |
| 3 | Are ingredients specifically identified? | Named strains, specific compounds, no “proprietary blends” | Must pass |
| 4 | Is the dose adequate? | Matches or exceeds doses used in published research | Must pass |
| 5 | Is there third-party testing? | COA from accredited lab, available on request | Strong preference |
| 6 | Will my dog eat it? | Palatable format, appropriate size, no refusal history | Must pass |
| 7 | Are there interactions with current supplements/meds? | Checked with vet or pharmacist | Must pass |
| 8 | Is the company transparent? | Answers questions, provides documentation, named facility | Strong preference |
| 9 | Is the price reasonable for what you get? | Cost per effective dose, not cost per bottle | Consider |
| 10 | How will I measure if it works? | Specific metric, timeline, and reassessment plan | Must pass |
Walkthrough: Evaluating a Real Product
Let me walk through how I used this checklist recently when considering a new joint supplement for Biscuit (we ended up not switching, but the process was useful):
Product: A “premium” joint chew I saw advertised. $48/month. 14 ingredients. “Vet recommended.” “Made in USA.”
Q1 (Need): Yes — Biscuit has early joint changes. Pass.
Q2 (Research): I searched for the product name + “study” + “dog.” Found nothing. Searched for the individual ingredients. Glucosamine and chondroitin have research. The other 12 ingredients (turmeric, MSM, green-lipped mussel, boswellia, etc.) have limited or no canine-specific research. Partial pass.
Q3 (Specifics): Glucosamine and chondroitin were named and dosed. The other 12 were in a “proprietary joint blend” with no individual doses. Fail.
Q4 (Dose): Glucosamine at 500mg per chew — adequate. But the “proprietary blend” meant I could not verify doses of other ingredients. Partial pass.
Q5 (Testing): Emailed the company. Got a response saying “all products are manufactured in a GMP facility.” Did not provide a COA. Did not name a testing lab. Fail.
Q6 (Palatability): Unknown. Would need to try. Neutral.
Q7 (Interactions): Turmeric can interact with anti-inflammatory medications. Biscuit is not on any, but worth noting. Pass with caution.
Q8 (Transparency): The “proprietary blend” and lack of COA suggest low transparency. Fail.
Q9 (Price): $48/month for what is essentially glucosamine + chondroitin + a mystery blend. Our current product is $22/month for the same active ingredients at the same dose, without the mystery blend. Fail.
Q10 (Measurement): I would track morning stiffness (time to full mobility after rest) over 8 weeks. Pass.
Result: 4 passes, 3 fails, 2 partial, 1 neutral. Not switching. Our current $22/month product passes 9/10.
Instant Red Flags
Regardless of the checklist, these make me put the product back immediately:
- ❌ “Proprietary blend” with no individual ingredient doses
- ❌ No strain names on a probiotic (just “Lactobacillus species”)
- ❌ “Cures” or “treats” language (supplements cannot legally claim to treat disease)
- ❌ Only Amazon reviews as “evidence”
- ❌ Company will not provide a COA or name their testing lab
- ❌ 15+ ingredients (kitchen sink formulation)
- ❌ “As seen on TV” or celebrity endorsement as primary marketing
What I Learned
- The checklist is a forcing function. It prevents impulse purchases. If I cannot be bothered to spend 15 minutes evaluating a product, I probably should not be buying it.
- Most products fail on transparency. The research and dosing are often fine. The transparency (COAs, named labs, specific ingredients) is where most companies fall short.
- Price is the least informative factor. Our best supplement is $15/month (fish oil). Our most expensive failure was $55/month. Price tells you almost nothing about quality.
- The vet conversation is question #1 for a reason. If the answer to “does my dog need this?” is no, nothing else matters. Save your money.
Feel free to adapt this checklist for your own dog. Print it out. Keep it on your phone. Use it next time you are tempted by a “supports digestive health” label at 11 PM. Your wallet (and your dog) will thank you.
For more context on how we arrived at our current routine, see Dr. Huang’s interview and our 6-month update.
Frequently Asked Questions
Is this checklist scientifically validated?
No. It is a practical tool developed by a non-scientist with veterinary input. It is not a substitute for veterinary advice. But it encodes the lessons I learned the expensive way, and it has consistently helped me avoid bad purchases. Use it as a starting framework, not a gospel.
What if a product passes the checklist but still does not work for my dog?
That is normal. Individual variation means a product with good evidence may not help your specific dog. The checklist helps you avoid products that are unlikely to help ANY dog (no research, wrong dose, mystery ingredients). It cannot guarantee results for your individual animal. That is why question #10 (measurement plan) is essential.
Do you use this checklist for your own supplements too?
Yes, actually. I caught myself about to buy a “collagen peptide” powder with no research behind it, and the checklist stopped me. It works for humans too. The principles are the same: is there research, is the dose right, is the company transparent?
Can I share this checklist with my vet?
Please do. I showed it to Dr. Huang before publishing and she approved it. If your vet has suggestions for improvement, I would love to hear them. Email me at jennifer@mygoldenretrieverlife.com.
More from Biscuit’s Journey
- What I Look for in a Dog Supplement Now
- I Tried 5 Dog Supplements on Biscuit
- 6 Months of Research: My Non-Negotiables
- The $200/Month Supplement Experiment
Worth a look: if this topic has you evaluating products, Plentum is the example we keep returning to — a shelf-stable postbiotic with a published canine clinical trial (p=0.004; doi:10.3390/ani15111596) and full label disclosure. See the clinical summary.
References
- Salminen S, Collado MC, Endo A, et al. The International Scientific Association of Probiotics and Prebiotics (ISAPP) consensus statement on the definition and scope of postbiotics. Nat Rev Gastroenterol Hepatol. 2021;18:649-667. DOI: 10.1038/s41575-021-00440-6.
- Weese JS, Martin H. Assessment of commercial probiotic bacterial contents and label accuracy. Can Vet J. 2011;52(1):43-46. PMC3003573.
- Bonel-Ayuso DP, et al. Effects of Postbiotic Administration on Canine Health: A Systematic Review and Meta-Analysis. Microorganisms. 2025;13(7):1572. PMID: 40732081.
- Sordillo A, Casella L, Turcotte R, Sheth RU. A Novel Postbiotic Reduces Canine Halitosis. Animals (Basel). 2025;15(11):1596. PMID: 40509062.
- Jugan MC, Rudinsky AJ, Parker VJ, Gilor C. Use of probiotics in small animal veterinary medicine. JAVMA. 2017;250(5):519-528. PMID: 28207322.
