Should I Give My Dog Probiotics or Multivitamins?

Short answer: you likely don't have to choose. Probiotics and multivitamins support different parts of your dog's health, and many dogs benefit from both. Probiotics focus specifically on gut and digestive health, while a multivitamin fills broader nutritional gaps across immunity, coat, joints and energy. Doggy Dailies makes a dedicated Probiotic Chew and a 10-in-1 Multivitamin Chew, so you can pick exactly what your dog needs. Below, we break down what each does, what the evidence actually says, whether your dog needs one or both, and how to build a simple daily routine.

Written by Jamie Sinclair, who writes about canine health, nutrition, and everyday care for Doggy Dailies — focused on translating veterinary research and real ingredient science into practical, honest guidance UK dog owners can use.

Table of Contents

• What's the Difference Between Probiotics and Multivitamins?
• What Do Probiotics Actually Do?
• What Does the Evidence Say?
• What Does a Multivitamin Actually Do?
• Probiotics vs Multivitamin: Side-by-Side
• Can I Give My Dog Both?
• Which Does My Dog Actually Need?
• Building a Simple Daily Supplement Routine
• What If My Dog Won't Take Supplements?
• Potential Side Effects to Watch For
• FAQ
• Sources

What's the Difference Between Probiotics and Multivitamins?

It helps to think of them as doing two different jobs. A probiotic is a targeted supplement: live beneficial bacteria specifically for gut and digestive balance (see our full guide to dog probiotics). A multivitamin is broader: a blend of vitamins and minerals covering general wellness across several body systems at once (our guide to daily vitamins breaks this down further).

What Do Probiotics Actually Do?

Probiotics work on your dog's gut microbiome, the balance of bacteria that affects digestion, stool quality and parts of immune function. The American Kennel Club suggests they're most useful for dogs that get loose stools in stressful situations (kennels, shows, vet visits) and for dogs taking antibiotics. In practice that means:

• Occasional loose stools or digestive upset
• Dogs recovering from a course of antibiotics
• Sensitive stomachs after diet changes or new treats
• Stressful events such as boarding or travel

Our Probiotic Chews deliver 3 billion CFU from five Lactobacillus strains per serving, alongside colostrum and salmon oil. That's three times the probiotic content of our Multivitamin Chews, which is the point: a dedicated probiotic is built for dogs with a specific digestive need.

What Does the Evidence Say?

Here's the honest picture, because most supplement brands skip it. Digestive upset is extremely common: a UK study of dogs under primary veterinary care found roughly 1 in 12 dogs is diagnosed with acute diarrhoea every year, and probiotics were the single most common thing vets reached for, used in about 60% of cases, ahead of diet changes and antibiotics. UK vets are increasingly steered away from antibiotics for uncomplicated diarrhoea, which is part of why probiotics have become the first-line option.

How strong is the evidence they work? A 2019 systematic review in the Journal of Veterinary Internal Medicine found some studies showed slightly fewer days of diarrhoea and better stool consistency, particularly around kennelling, but concluded the overall evidence isn't yet robust enough to be definitive. Meanwhile, more recent trials summarised by dvm360 found dogs given probiotics after antibiotics recovered their gut microbiome faster than placebo. So: promising and low-risk, with the clearest benefit around antibiotics and stress, but not a miracle cure.

For multivitamins the evidence is simpler and less flattering: PetMD is clear that a dog eating a complete, life-stage-appropriate food doesn't need one. Their value is in filling gaps for the dogs that have them: seniors, fussy eaters and dogs on home-cooked diets.

What Does a Multivitamin Actually Do?

A multivitamin covers ground a probiotic doesn't touch: vitamins and minerals supporting immune function, coat and skin condition, joint comfort and general energy levels. Our 10-in-1 Multivitamin Chews include:

• Glucosamine, Chondroitin & MSM for joint support
• Krill Oil & Flaxseed for skin and coat condition
• Vitamins A, C, D3, E & the B-complex group for immune and energy support
• Manganese, Zinc & Selenium as supporting trace minerals
• A 1 billion CFU probiotic blend and pumpkin for everyday digestive support

That last point matters: our Multivitamin Chews already include a baseline probiotic, because gut health underpins so much of general wellness. But it's a third of what's in the dedicated Probiotic Chews, which is why dogs with specific digestive needs usually do better with a targeted probiotic alongside it, not instead of it.

Probiotics vs Multivitamin: Side-by-Side

Can I Give My Dog Both?

Yes. They target different systems, so there's no meaningful overlap to worry about. Many dogs do well on a daily multivitamin for general wellness, with a dedicated probiotic added during periods of digestive sensitivity, after antibiotics, or as ongoing extra gut support. The one thing worth checking: if you're using several supplements, glance at the labels to avoid unnecessarily doubling up on the same fat-soluble vitamin (A, D, E, K) at high levels. Because Doggy Dailies makes both, you can build a combined routine from products designed to sit alongside each other.

Which Does My Dog Actually Need?

• Choose a probiotic if your dog has ongoing digestive issues, is recovering from antibiotics, has a sensitive stomach, or gets loose stools when stressed
• Choose a multivitamin if your dog is a senior, a fussy eater or on a home-cooked diet, or you want broad daily coat, joint and immune support in one chew
• Choose both if you want comprehensive daily support and your dog has any history of digestive sensitivity

When in doubt, a quick word with your vet about your dog's specific history and diet is the most reliable way to decide.

Building a Simple Daily Supplement Routine

1. Give both at the same time each day, ideally alongside a meal, so it becomes an automatic part of the routine
2. Follow the usage chart for your dog's weight on each product; don't guess the amount
3. Be consistent: both probiotics and multivitamins are designed for daily use, not one-off treats
4. Watch for changes in digestion, coat condition and energy over the following weeks

What If My Dog Won't Take Supplements?

If your dog is fussy, a soft daily chew (rather than a pill or powder) is usually the easiest fix; most dogs take a flavoured chew as readily as a treat. If your dog is still hesitant, try crumbling the chew into their regular food for the first few days until they're used to the taste.

Potential Side Effects to Watch For

Both probiotics and multivitamins are generally well tolerated, but as with any new addition to your dog's routine, it's worth watching for:

• Mild digestive upset in the first few days as their gut adjusts
• Reduced appetite
• Any signs of an allergic reaction

If you notice any of the above, stop use and speak to your vet.

FAQ

Can I give my dog a probiotic and a multivitamin on the same day?
Yes. They target different systems, so there's no meaningful overlap. Just check labels if using several products to avoid doubling up on the same vitamin unnecessarily.

Do multivitamins already contain probiotics?
Some do, ours included, but usually at a smaller, baseline level compared to a dedicated probiotic product. Our Multivitamin Chews contain 1 billion CFU; our Probiotic Chews contain 3 billion.

How long before I see results from probiotics or a multivitamin?
It varies by dog and by what you're supporting. Digestive changes from a probiotic are often noticed within days, while coat or energy changes from a multivitamin tend to take several weeks of consistent use. Neither works as a one-off.

Is a multivitamin necessary if my dog eats a balanced diet?
Most dogs on a complete, balanced diet get their core nutrients from food, but multivitamins can still help fill gaps for seniors, fussy eaters or dogs on home-cooked diets.

Can puppies have probiotics and multivitamins?
Our Multivitamin Chews are suitable from 12 weeks old. For any product, check the specific usage guidance and confirm with your vet first.

Sources

• American Kennel Club — Probiotics for Dogs
• Epidemiology and clinical management of acute diarrhoea in dogs under primary veterinary care in the UK (PMC)
• Jensen & Bjørnvad (2019) — Clinical effect of probiotics in prevention or treatment of gastrointestinal disease in dogs: a systematic review, J Vet Intern Med
• dvm360 — Acute canine diarrhea: is it time to rethink our treatment approach?
• PetMD — Dog Vitamins: How Do They Work, and Does Your Dog Need Them?

This article is for general information only and isn't a substitute for veterinary advice. Please speak to your vet before starting any new supplement, especially if your dog has an existing health condition or is on medication.

Ready to build a simple daily wellness routine? Shop our Probiotic Chews or 10-in-1 Multivitamin Chews, both vet-formulated, trusted by over 100,000 UK dog owners, with free UK delivery.