Dog Supplements

Four vet approved dog supplements in daily chews, each built to work alongside your dog's food. Joint Care combines Kynosil®, glucosamine, chondroitin and collagen-rich egg membrane to support joint health and mobility. Calming blends chamomile with B vitamins to support calm and relaxation. Probiotic supports a balanced gut microbiome and healthy digestion, and Dental with EpiCor® supports oral health and fresher breath. 120 chews per tub, dosed daily by weight, suitable from 12 weeks and made in the UK. Proper support, properly formulated.

Dog Supplements
Four vet approved dog supplements in daily chews, each built to work alongside your dog's food. Joint Care combines Kyno…
Dog Supplements
Dog Supplements
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  • WITHIN probiotics for dogs, Advanced Probiotic Chews 120 tub with chews

    Advanced Probiotic Chews For Dogs | 120

    Advanced Probiotic Chews For Dogs | 120
    Supports a Balanced Microbiome
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    Aids Healthy Digestion
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    Promotes Healthy Stools
  • WITHIN dog joint supplement, Advanced Joint Care Chews 120 tub with chews

    Advanced Joint Care Chews For Dogs | 120

    Advanced Joint Care Chews For Dogs | 120
    Supports Bone Health
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    Supports Flexibility
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    Aids Mobility
  • WITHIN calming chews for dogs, Advanced Calming Chews 120 tub with chews

    Advanced Calming Chews For Dogs | 120

    Advanced Calming Chews For Dogs | 120
    Supports Through Stress
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    Supports Calm & Focus
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    Promotes Relaxation
  • WITHIN dog dental chews, Advanced Dental Chews 120 tub with chews

    Advanced Dental Chews For Dogs | 120

    Advanced Dental Chews For Dogs | 120
    Supports Oral Microbiome
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    Helps Reduce Plaque
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    Natural Active Ingredients

What makes WITHIN dog supplements different?

Vet approved icon

Vet approved formulas

Every chew is developed by our pet nutritionist and approved by our veterinary advisor through an 11-point framework.

Active ingredients icon

Targeted active ingredients

Each tub has one clear job, with named actives like Kynosil®, EpiCor®, glucosamine and chamomile listed on every label.

Chews, not tablets

An easy daily chew, with no tablets to crush or hide in your dog's food.

Supplement tub icon

120 chews, dosed by weight

A simple daily dose of 1 to 4 chews by weight, so one tub lasts up to four months for dogs under 10kg.

Our standards

The WITHIN dog supplement standard

Targeted support, properly formulated.

Every WITHIN chew is vet approved, made in the UK and built around named active ingredients. Here's what goes into every tub, and why.
Joint supplements for dogs, with Kynosil®

Our Advanced Joint Care Chews combine Kynosil® silicon (silicium), which supports collagen synthesis and bone mineralisation, with glucosamine and chondroitin to help maintain joint structure and cartilage integrity. Collagen-rich egg membrane and vitamin C support collagen synthesis, MSM supports joint comfort and tissue resilience, and prebiotic MOS and inulin are included too. A natural choice for active dogs and senior dogs alike.
Calming chews for dogs, with chamomile and B vitamins

Our Advanced Calming Chews combine chamomile flower extract with L-glutamine, magnesium and ginger root, plus vitamins B1, B6 and B12 to support brain and emotional health, and vitamin C to help manage stress. They're a gentle daily calming supplement for dogs who find fireworks, travel or time alone unsettling. There's no valerian, tryptophan, theanine or hemp.
Probiotics for dogs, in a daily chew

Our Advanced Probiotic Chews combine two probiotics, Bacillus velezensis and Enterococcus faecium, with postbiotic inactivated yeast and yucca root. Together they support a balanced gut microbiome and healthy digestion, and yucca helps to reduce stool odour. Probiotic chews for dogs are a simple way to add daily gut health support.
Dental chews for dogs, with EpiCor®

Our Advanced Dental Chews combine dried algae (Ascophyllum nodosum) with EpiCor®, a postbiotic yeast, plus citrus and cranberry extracts, vitamin C, parsley and peppermint leaf. Together they support oral health and fresher breath as part of your dog's daily routine, alongside regular tooth brushing.
Daily dosing, from puppies to senior dogs

Every tub holds 120 chews. Give 1 chew a day for dogs under 10kg, 2 for dogs from 10 to 30kg, 3 for 30 to 45kg and 4 for dogs over 45kg. Our chews are suitable from 12 weeks, so they work for puppies, adults and senior dogs, and Joint Care is a natural choice among senior dog supplements. Allow 4 to 6 weeks of daily use to see the full benefits.
Vet approved and made in the UK

Every WITHIN chew is developed by our pet nutritionist, Emma Passman, and approved by our veterinary advisor, Dr Jason Aldiss BEM BVSc MRCVS, through our 11-point vet approval framework. Our supplements are made in the UK and designed to complement WITHIN food, so your dog's daily nutrition works together.

Got a question? Let's get into it.

From choosing the right chew to daily dosing, here's what you need to know about WITHIN dog supplements.
Labrador Retriever looking attentively at the camera in a home setting in a lifestyle image for WITHIN.
What are the best dog supplements in the UK?

The best dog supplement is the one that matches your dog's needs. Start with the job you want it to do: joint support, calm, gut health or oral health. Then look for named active ingredients, clear dosing by weight and a vet approved formula. Each WITHIN chew is targeted at one need, with actives like Kynosil®, EpiCor®, glucosamine and chamomile listed on every label, and every formula is vet approved and made in the UK.
Does my dog need supplements if they eat a complete food?

A complete and balanced food like WITHIN provides everything your dog needs day to day. Supplements add targeted support for specific needs, such as ageing joints, a sensitive gut, stressful situations or oral health. Our chews are designed to complement WITHIN food and work alongside any complete diet. If you're unsure whether your dog would benefit, ask your vet.
Are WITHIN supplements suitable for puppies?

Yes. All four WITHIN chews are suitable from 12 weeks, so they work as puppy supplements too, dosed by your puppy's weight. If you're looking for puppy probiotics, our Advanced Probiotic Chews support a balanced gut microbiome and healthy digestion.
What are the best supplements for senior dogs?

As dogs get older, joint support is often the first priority. Our Joint Care Chews combine Kynosil®, glucosamine, chondroitin and collagen-rich egg membrane to support joint health and mobility. Our Probiotic and Dental chews can also support gut and oral health in older dogs. If your senior dog has a health condition, check with your vet first.
How long do dog supplements take to work?

Allow 4 to 6 weeks of daily use to see the full benefits. Supplements work gradually, so consistency matters: give the recommended number of chews every day, based on your dog's weight.
What's the difference between a supplement chew and a treat?

Treats are rewards. WITHIN chews are daily supplements, with named active ingredients given at a set dose based on your dog's weight. That's why we recommend sticking to the daily amount on the tub, rather than using them as treats.
How long does a tub last, and can I subscribe?

Each tub holds 120 chews, so it lasts 120 days for dogs under 10kg, 60 days for dogs from 10 to 30kg, 40 days for 30 to 45kg and 30 days for dogs over 45kg. Subscribe and save 25% on every delivery, and pause, skip or cancel anytime. Standard delivery is free on orders over £35.