Max Strength Plus – Dog Joint Supplement Porridge
Max Strength Plus is our all-in-one daily porridge with serrapeptase added: joint nutrients, our full Nourish + C multivitamin and mineral blend, omega 3 and 6, probiotics, and 75mg of serrapeptase. Gluten and wheat free, made in the UK, from around 76p a day for a medium dog.
- Made in the UK with human-grade ingredients
- Free delivery on orders over £54.95
- Subscribe: 50% off your first month, then 10% off every order
Max Strength Plus is our all-in-one daily porridge with serrapeptase added. It contains everything in Max Strength (glucosamine, chondroitin, MSM and hyaluronic acid, our full Nourish + C multivitamin and mineral blend, omega 3 and 6, and probiotics and prebiotics) plus 75mg of serrapeptase, a natural enzyme originally derived from silkworms. Gluten and wheat free, made in the UK, from around 76p a day for a medium-sized dog.
Who it's for
Max Strength Plus is a good choice if your dog is:
- a working dog: gundogs, herding dogs, search and rescue and more
- a sport or performance dog: agility, flyball, canicross, sled or detection work
- very active or athletic
- older and beginning to slow down or stiffen up
- one you'd like to give joint support and all-round nutrition in a single daily feed
- one you'd like to give serrapeptase alongside joint support and all-round nutrition
Not sure which supplement is right?
- Max Strength Plus: everything in Max Strength, with 75mg serrapeptase added.
- Max Strength: the same porridge without serrapeptase, at a lower price.
- Hip & Joint Dog / Hip & Joint Dog PLUS: concentrated joint powders you add to your dog's usual food, with higher daily amounts of glucosamine and MSM.
How to feed it and what it costs
| Dog size | Scoop per day | Approx. grams |
|---|---|---|
| Small (0–15kg) | ½ scoop | ~20g |
| Medium (15–40kg) | 1 level scoop | ~40g |
| Large (40kg+) | 1 heaped scoop | ~60g |
Mix with warm water to make a porridge, stir into wet food, or sprinkle over wet or dry food. Recommended from 9 to 12 months old upwards.
Optional loading phase: double the daily amount for the first 7 days when starting Max Strength Plus.
Cost per day for a medium dog: 1.2kg (30 days) £1.05 · 1.8kg (45 days) 93p · 2.4kg (60 days) 91p · 5kg (125 days) 79p · 10kg (250 days) 76p.
Subscribe: 50% off your first month, then 10% off every order, and you'll never run out.
Days' supply is based on the medium-dog amount above, so smaller dogs' tubs last longer and larger dogs' less. A 75ml scoop is included with every order; let us know at checkout if you'd prefer not to receive one with future purchases.
What's in it (per medium-dog daily serving of about 40g)
🌾 Gluten and wheat free. Complements all diets, including raw.
Joint nutrients
| Glucosamine HCl | 1,000mg |
| MSM (methylsulfonylmethane) | 1,000mg |
| Chondroitin sulphate | 1,200mg |
| Hyaluronic acid | 300mg |
| Serrapeptase | 75mg (250,000IU) |
Vitamins, minerals, amino acids, omegas and probiotics
| Vitamin A (retinol) | 6096iu |
| Vitamin B1 (thiamin) | 2.13mg |
| Vitamin B2 (riboflavin) | 1.3mg |
| Vitamin B5 (pantothenic acid) | 1.38mg |
| Vitamin B6 (pyridoxine) | 1.13mcg |
| Vitamin B7 (biotin) | 7.83mcg |
| Vitamin B12 (cobalamin) | 1.78ug |
| Vitamin C (ascorbic acid) | 1564iu |
| Vitamin D | 35.86iu |
| Vitamin E | 33.6mcg |
| Vitamin K | 1.38mg |
| Alanine | 460.3mg |
| Arginine | 707mg |
| Calcium | 142.75mg |
| Choline | 38.4mg |
| Chromium | 0.32mg |
| Copper | 8.125mg |
| Cystine | 320.95mg |
| Folate | 19.66mg |
| Glutamic acid | 2174mg |
| Glycine | 472.14mg |
| Histidine | 245.33mg |
| Iron | 23.54 |
| Iodine | 0.037mg |
| Niacin | 0.82mg |
| Nucleotide monophosphates | 8mg |
| Isoleucine | 451.23mg |
| Leucine | 829.3mg |
| Lysine | 597.5mg |
| Magnesium | 89.74mg |
| Manganese | 18.5mg |
| Methionine | 172.91mg |
| Nicotinic acid | 0.9mg |
| Omega 3 | 1308.2mg |
| Omega 6 | 1725.5mg |
| Phosphorus | 404.94mg |
| Probiotic (Lactobacillus acidophilus and Bifidobacterium) | 1.4 billion CFU |
| Prebiotic (oligosaccharides) | 101.4mg |
| Potassium | 132.6mg |
| Selenium | 19.98ug |
| Tryptophan | 180.7mg |
| Threonine | 354.9mg |
| Tyrosine | 330.97mg |
| Valine | 603.29mg |
| Zinc | 8.32mg |
Analytical constituents: Protein 15.3%, Fibre 10.3%, Fat 5.7%, Omegas 3 and 6 8.9%, Crude Ash 3.1%.
Frequently asked questions
What's the difference between Max Strength Plus and Max Strength?
They're the same porridge, but Max Strength Plus has 75mg of serrapeptase, a natural enzyme, added.
How is Max Strength Plus different from Hip & Joint Dog PLUS?
Both contain serrapeptase. Max Strength Plus is an all-in-one porridge with joint nutrients, a full multivitamin and mineral blend, omega 3 and 6, and probiotics. Hip & Joint Dog PLUS is a concentrated joint powder you add to your dog's normal food, and gives higher daily amounts of glucosamine and MSM (2,500mg each for a medium dog, compared with 1,000mg in Max Strength Plus).
How do I feed it?
Mix with warm water to make a porridge, stir it into wet food, or sprinkle it over wet or dry food. A medium dog (15–40kg) needs one level scoop (about 40g) a day.
How long does a tub last?
A 1.2kg tub lasts a medium dog (15–40kg) around 30 days, a small dog (up to 15kg) around 60 days and a large dog (40kg+) around 20 days.
From what age can my dog have it?
We recommend feeding it from 9 to 12 months old upwards.
Is it suitable for raw-fed or sensitive dogs?
Yes. It complements all diets, including raw, and it's gluten and wheat free.
Is it suitable for competition and working dogs?
Yes. None of the ingredients are banned by the GBGB, IGB, ISDS, British Flyball Association, IFSS, the Kennel Club, UK Agility or BASC.
Can I give it alongside medication?
If your dog takes medication, is injured or has an ongoing health condition, please check with your vet before using this supplement.
Can I claim for it on pet insurance?
Some of our customers have successfully claimed for this supplement through Petplan. Check your own policy, as cover varies.
Find out more about claiming on pet insurance
Note for competition and working dogs
(Greyhounds, sheepdogs, flyball, sled dogs, agility, gundogs and more)
All the ingredients in our products are natural and contain no prohibited or banned substances. None of our ingredients are banned by:
- Great Britain Greyhound Board (GBGB)
- Irish Greyhound Board (IGB)
- The International Sheep Dog Society (ISDS)
- British Flyball Association (BFA)
- International Federation of Sleddog Sports (IFSS)
- The Kennel Club
- UK Agility (UKA)
- The British Association for Shooting and Conservation (BASC)
All Winston & Porter products are developed in line with European Pet Food Industry Federation (FEDIAF) and National Research Council (NRC) nutritional guidelines.
Good to know
♻️ Packaging: all our containers, scoops and packaging are recyclable, and we reuse boxes wherever possible to reduce our carbon footprint. The 5kg and 10kg sizes come in strong, recyclable brown paper sacks. Refurbished, fully sanitised resealable tubs are also available as an eco-friendly option.
We're unable to offer next-day delivery to the Scottish Highlands and Islands, the Isle of Man, the Channel Islands or international addresses.
Read more: Supporting joint health and mobility from puppy to senior · Best dog joint supplements UK (2026 guide)
Important information
- Contraindications: do not use if your dog has a known allergy, hypersensitivity or intolerance to any of the listed ingredients.
- Adverse reactions: in the unlikely event that your dog becomes unwell after use, stop immediately and seek veterinary advice.
- Disclaimer: this is a nutritional supplement and is not intended to diagnose, treat, cure or prevent disease. No guarantee of prevention or recovery is implied. If your dog is injured, has persistent stiffness or reduced mobility, or takes medication, speak to your vet before use.
Fast, tracked delivery from our base in Northallerton. Order before 12:30pm Monday to Friday and we’ll dispatch the same working day.
Shipping charges
Our shipping charges are calculated automatically at the cart stage based on the delivery method selected, parcel weight and destination.
We work closely with our courier partners to keep delivery costs as fair and competitive as possible. Shipping charges reflect the actual cost of delivery and handling.
Delivery partners and services
We primarily use Royal Mail Tracked and DPD. Depending on parcel size, weight or destination, orders may be shipped using an alternative courier.
Royal Mail Tracked services (UK)
| Service | Estimated delivery | Description |
|---|---|---|
| Tracked 24 | Next business day* | Express UK delivery |
| Tracked 24 (Signature) | Next business day* | Express UK delivery with signature |
| Tracked 48 | 1–2 business days* | Standard UK delivery |
| Tracked 48 (Signature) | 1–2 business days* | Standard UK delivery with signature |
*Royal Mail delivery times are estimates only and are not guaranteed next-day services.
Order cut-off times
- Orders placed before 12:30pm (Monday–Friday) are processed and dispatched the same working day.
- Orders placed after 12:30pm may be dispatched the following working day.
- Orders placed on weekends or public holidays are processed on the next working day.
Next day delivery and weekends
- Orders placed for next day delivery after 12:00pm on Friday, or on Saturday or Sunday, will be dispatched on Monday.
- Orders placed before 12:00pm on Friday for next day delivery will be dispatched on Friday but may not arrive until Monday.
Free UK delivery
Free standard delivery is available on orders over £54.95 to England, Scotland and Wales. This is applied automatically at checkout where eligible.
- Scottish Highlands & Islands: free only if the parcel weighs under 2kg (see below).
- Not available to Northern Ireland, the Channel Islands, the Isle of Man or international destinations. Delivery charges for these areas are shown at checkout.
Scottish Highlands & Islands
Next day delivery is not available to the following areas. These orders are sent using Royal Mail Tracked services (not guaranteed next day).
- Scottish Highlands & Islands
- Isle of Man
- Channel Islands
- International destinations
Highlands & Islands postcodes include (but are not limited to)
Free delivery to the Highlands & Islands
- Orders over £54.95 qualify for free delivery only if the parcel weighs under 2kg.
- Orders over 2kg will incur a delivery charge, even if the order value is over £54.95.
Safe places and delivery responsibility
If you request delivery to a safe place or a neighbour, this is done entirely at your own risk. Winston & Porter cannot accept responsibility for parcels that are lost, stolen or damaged after being left in a location you have specified.
Please add any delivery instructions at checkout in the “Add notes to seller” section (for example “With neighbour” or “In shed”).
Delays and courier issues
Once an order has been dispatched, delivery is the responsibility of the courier. We will always help to resolve delivery issues, but we cannot be held liable for delays caused by courier services, weather conditions or circumstances beyond our control.
International shipping
Customers are responsible for making sure the items they order comply with their country’s import regulations.
- 🇺🇸 USA: we send with Royal Mail International Tracked, and your shipping cost already includes all customs taxes and handling fees. No surprise charges on delivery, just the price you see at checkout.
- 🇦🇺 Australia: import taxes, customs duties and handling fees are not included in the shipping cost. These are charged separately on arrival and are payable by the recipient.
- For all other international destinations, customs fees, duties and taxes are the responsibility of the customer.
- If customs reject or return an item, original shipping charges are non-refundable.
- Returned international orders may be refunded for the product cost only, excluding shipping, or re-shipped at additional cost.
Need help with delivery?
If you’re unsure about shipping costs or delivery options, get in touch before placing your order and we’ll be happy to help.
Call us on 01609 770 849 or email info@winstonandporter.com and we'll help you pick the right supplement.
