How to Build a Daily Supplement Routine for Your Dog (Without Overdoing It)

Half of American dogs now get at least one supplement. In the Dog Aging Project, a study of more than 40,000 US dogs, 52% received supplements, most often omega-3s and joint products (Dog Aging Project, 2025). That's a big change from 2006, when a survey of US and Australian pet owners found just under 10% (Freeman et al., 2006).

As someone who formulated human supplements for years before starting LibertyPaw, I've seen both sides: supplements that genuinely fill a gap, and shelves of products that add cost, calories and risk without adding value. Here's how to build a routine for your dog that's purposeful, safe and easy to stick with.

Step 1: Start with the bowl, not the bottle

If your dog eats a commercial food labeled "complete and balanced," that food is designed to be the sole diet and to meet the nutrient profiles set by the Association of American Feed Control Officials (AAFCO), either by formulation or by a feeding trial (FDA). AAFCO calls this nutritional adequacy statement "perhaps the most important part of a label" (AAFCO).

That means a healthy adult dog on a complete diet usually doesn't need extra vitamins or minerals. The Merck Veterinary Manual puts it bluntly: "Nutritional supplements are not required and, in fact, may be harmful in some cases" (Merck Veterinary Manual). A Tufts University veterinary nutritionist agrees: "Unless a pet is eating a nutritionally unbalanced diet, multivitamins are not needed" (Tufts Petfoodology).

So the question isn't "which supplements should my dog take?" It's "what specific need am I trying to support?"

Step 2: Match each supplement to a real need

Good reasons to consider a supplement usually fall into a few categories:

If you home-cook: this is where a supplement matters most

Home-cooked diets are the clearest case for supplementation, and the research is sobering. A UC Davis team analyzed 200 home-prepared dog food recipes from books, websites and even veterinary textbooks. 95% were short on at least one essential nutrient, and more than 83% had multiple shortfalls, most often choline, vitamin D, zinc and vitamin E. The only recipes that passed were written by board-certified veterinary nutritionists (Stockman et al., 2013; UC Davis).

Brazilian researchers found the same thing when they chemically analyzed homemade diets: none supplied all recommended nutrients (Pedrinelli et al., 2019). And here's the key point: in a follow-up study, simply adding a supplement "did not ensure a balanced diet" (Pedrinelli et al., 2021). If you cook for your dog, work with a board-certified veterinary nutritionist on a recipe that includes the right supplement, rather than guessing.

For joints: a daily joint chew plus omega-3s

Joint support is the most common reason owners supplement. Omega-3s are the most-studied ingredient: in one controlled study, 82% of dogs with arthritis on a fish-oil-enriched diet improved on a force plate, compared with 38% on the control diet (Roush et al., 2010). Multi-ingredient joint chews have smaller studies, several of them encouraging. In a 40-dog placebo-controlled trial, a blend containing glucosamine, chondroitin, boswellia, hyaluronic acid and type II collagen improved vet and owner assessment scores over 60 days (Martello et al., 2022). Many owners pair a daily joint chew with a fish oil that lists its EPA + DHA content. We cover this in depth in our guide to hip and joint supplements.

For skin and coat: a supporting role

International guidelines on canine atopic dermatitis list increasing essential fatty acid intake as one of the supportive steps, alongside bathing and avoiding triggers. The main itch control comes from veterinary treatment (Olivry et al., 2015). For more, see our guide to what’s actually in dog allergy chews.

For digestion: probiotics, with a quality caveat

In a trial of 773 shelter dogs, a probiotic-prebiotic supplement lowered the share of dogs with diarrhea in the first two weeks from 27.2% to 18.8% (Rose et al., 2017). But quality matters: when researchers tested 25 veterinary probiotic products, only 27% of those with specific claims met their label, and some contained no viable bacteria at all (Weese & Martin, 2011). Buy from companies that list exact strains and counts.

For senior dogs: ask before you add

Older dogs are the group most likely to be on several supplements and medications at once. The Dog Aging Project authors specifically recommend that veterinarians discuss supplement use with owners of senior pets (Dog Aging Project). Research on brain aging in dogs is promising, but the clearest results so far came from complete, specially formulated diets tested over months (Pan et al., 2018).

Step 3: Don't overdo it

This is the part most supplement marketing skips. Several nutrients are harmful in excess, and dogs on complete diets are already getting them.

• Vitamin D. In 2018 and 2019, the FDA warned owners after several commercial dog foods were found with up to about 70 times the intended vitamin D, which can cause kidney failure (FDA). The FDA also lists household vitamin D supplements as a source of poisoning in dogs (FDA). Merck notes signs have been reported at doses as low as 0.5 mg/kg (Merck).
• Vitamin A. Toxic effects occur at 10 to 1,000 times the dietary requirement, with signs ranging from appetite loss and peeling skin to tremors and seizures (Merck).
• Iron. Swallowing more than 50 mg/kg of elemental iron generally calls for veterinary treatment (Merck). Human multivitamins with iron are a common household risk.
• Calcium in large-breed puppies. Excess calcium, above 3% of the diet on a dry-matter basis, makes bone and cartilage problems worse in fast-growing large-breed puppies (Merck). Puppies absorb extra calcium passively and can't protect themselves from it (Tryfonidou et al., 2002). Don't add calcium to a complete puppy food.
• Omega-3s. Fish oil can cause stomach upset, affect platelet function and wound healing, and add calories (Lenox & Bauer, 2013). If your dog gets fish oil, a joint chew with fish oil and an omega-enriched food, add up the total EPA + DHA.
• Human products. Never give dogs human gummy vitamins or chewable supplements. Many contain xylitol, which can cause dangerously low blood sugar at doses above about 100 mg/kg and liver failure above 500 mg/kg (Merck).

Overlap is easy to miss. Many joint, skin and multi-purpose chews share ingredients such as glucosamine, MSM, fish oil and turmeric. When you give more than one product, read the labels side by side and add up the amounts.

Step 4: Count the calories

Soft chews taste good because they contain real food. The WSAVA says treats should make up no more than 10% of a dog's daily calories, and it counts "snacks, chews, supplements, and foods used to administer medication" as treats (WSAVA). The AAHA nutrition guidelines use the same 10% limit (AAHA, 2021). If you add two or three daily chews, trim treats or food slightly to keep your dog at a healthy weight, which matters more for joint health than any supplement.

Step 5: Build the routine one step at a time

There's no official protocol for introducing supplements, but this simple approach makes it much easier to tell what's helping and what isn't:

1. Write down your goal. "Easier getting up after naps" or "fewer loose stools on trips" is better than "general health."
2. Add one product at a time. Wait a week or two before adding another, so you know which product caused any stomach upset.
3. Follow the label dose for your dog's weight, and give it consistently. Many joint studies ran 6 to 12 weeks before seeing results.
4. Keep a simple log of what you give, when you started, and any changes you notice. It's also exactly what your vet will ask for, since WSAVA lists supplement use as part of every nutrition assessment (WSAVA guidelines).
5. Reassess. If a product hasn't made a noticeable difference after a fair trial, stop it rather than stacking more on top.

A sample routine

Step 6: Check for interactions

Supplements can interact with medications. The Merck Veterinary Manual warns that St. John's wort can cause serotonin syndrome when combined with SSRI medications such as fluoxetine, and that ginkgo, ginseng, ginger and garlic can increase bleeding risk around surgery (Merck). Researchers studying epileptic dogs note supplements may affect how anti-seizure drugs are absorbed and cleared (Berk et al., 2018).

Tell your veterinarian about every supplement, especially if your dog takes prescription medication, has a chronic condition, is pregnant or nursing, or has surgery scheduled.

How to read a supplement label

Animal supplements aren't regulated like human supplements. The FDA determined in 1996 that the law governing human supplements (DSHEA) doesn't apply to animals, and it regulates animal supplements as either food or drugs, without pre-market approval (FDA). Label accuracy has been a real problem: one review cites testing in which chondroitin content ranged from 0 to 115% of the label claim (Finno, 2020). Here's what to look for:

• Exact amounts per chew for every active ingredient (in milligrams, or CFU for probiotics), not just a list of ingredient names.
• Clear dosing by body weight.
• A lot number and expiration date, so a product can be traced if there's ever a problem.
• The company's name and contact information. AAFCO requires the manufacturer or distributor to be named on pet food labels (AAFCO), and WSAVA suggests choosing companies that provide a phone number or email for questions.
• The NASC Quality Seal or an NASC-audited manufacturer. Seal holders pass a facility audit every two years, keep adverse event reporting systems, follow labeling rules and undergo random independent product testing (NASC; NASC Seal). Keep in mind the seal covers quality and labeling (Finno, 2020).

Where LibertyPaw fits in a routine

We built our supplements to be targeted, so you can choose only what fits your dog. All of them are made in the USA by an NASC Preferred Supplier, with ingredient amounts listed on the label:

• Canine Hip & Joint supports healthy joints and everyday mobility.
• Canine Calm supports a relaxed demeanor during storms, travel and vet visits. See our calming supplement buyer’s guide.
• Canine Allergy supports normal skin comfort and a balanced seasonal response.
• Canine Multi is a multi-function chew rather than a vitamin-mineral formula. Its label lists a whole-food and mushroom blend, salmon oil, glucosamine, MSM and chondroitin, digestive enzymes and two probiotic strains, to support digestion, skin and coat, and overall wellness.

Canine Multi and Hip & Joint share some ingredients (glucosamine, MSM, chondroitin and turmeric). If you use both, follow each label and let your vet know, just as you would with any combination.

A simple daily multi-function chew

LibertyPaw Canine Multi supports healthy digestion, skin and coat, and overall wellness in one soft chew. Made in the USA by an NASC Preferred Supplier. Ask your vet if your dog takes other medications.

Shop Canine Multi

Building a routine for a senior dog? Our plan to prevent winter weight gain pairs well with this guide, since calories from chews and treats add up quickly when walks get shorter.

Frequently asked questions

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