Quick answer: side effects from Dasuquin are rarely reported, but there's very little UK feedback to go on. None of the seven UK reviews we found mention a side effect, and Protexin's product page lists no warnings or contraindications. Like any supplement, it can upset some dogs' stomachs, and it contains poultry protein and soy, plus brewer's yeast in the Large tablet. If Dasuquin hasn't suited your dog, we'd recommend trying MedPaw Hip & Joint Chews instead, with a 60-day money-back guarantee if it doesn't suit.
Transparency note: this page is written by MedPaw, which makes a competing joint supplement. Reviews are quoted word for word with links so you can check them. Dasuquin's label details come from Protexin Veterinary and UK retailers. Everything was checked on 8 October 2026.
What Dasuquin's label says
Dasuquin is a joint supplement, not a medicine, so it doesn't come with a list of side effects like a prescription drug. Here's what we could find:
- Warnings and contraindications: none listed on Protexin's product page. PDSA Pet Store adds only that it's for animal use and should be kept out of reach of children.
- Vet advice: the feeding guide says to give it "as recommended by your veterinary surgeon".
- Pancreatitis: asked about a dog with chronic pancreatitis, a Viovet vet said the dose was small and unlikely to cause a flare-up, but advised checking with your own vet first, because "Dogs with severe chronic pancreatitis can be set off by any dietary change."
- Other joint supplements: a Viovet staff answer advises against giving Dasuquin with a similar joint supplement, because "giving both will be an overdose of the ingredients within."
- Pregnancy and nursing: we found no guidance. Ask your vet first.
- Dose: the loading dose runs for 4 to 6 weeks before being halved. Your dog gets the most during that time, so that's when to watch closely.
What owners actually report
There's very little UK feedback. We read all six reviews at Viovet (2018 to 2026) and the single review at PDSA Pet Store. None mentioned a side effect:
Side effects in the UK Dasuquin reviews we read (7 reviews)
| Reported effect | How often | Notes |
|---|---|---|
| Upset stomach, diarrhoea or vomiting | None found | Seven reviews is too few to say how common it is |
| Itching or skin reaction | None found | |
| Refusing the tablet | None found in UK reviews | Two UK owners said their dog liked the tablets; one US owner said their dog refused US Dasuquin Advanced |
The US report: "My hound dog that will almost eat anything refuses to take these meds." (Ken S., Trustpilot, 1 star, March 2026). That was about Dasuquin Advanced as sold in the US, which has a different formula.
A vet-written US guide to Dasuquin Advanced from VCA Animal Hospitals says there are no documented side effects, but that oral supplements can cause "mild gastrointestinal symptoms such as loose stools, flatulence and stomach upset". It also advises caution with blood thinners and diabetes medicines. That guide covers the broader US formula, but the glucosamine and chondroitin are common to both. For the wider picture, see our Dasuquin reviews.
Dasuquin allergens and ingredients to check
Dasuquin doesn't publish an allergen statement, and the ingredient lists from Protexin and from retailers differ. Based on both:
Common allergens in Dasuquin for Dogs (UK)
| Allergen | In Dasuquin? |
|---|---|
| Poultry | Yes, hydrolysed animal protein (poultry) |
| Soy | Yes, in the ASU; retailer lists also include soy lecithin and soya protein isolate |
| Yeast | Brewer's yeast in the Large tablet (Protexin); retailers list it for both |
| Animal-derived ingredients | Chondroitin from animal tissue |
| Fish, krill or shellfish | Not listed; Protexin says the glucosamine comes from fermentation |
| Egg or dairy | Not listed |
| Sugar | Contains dextrose |
Because the lists don't agree, check the tub you actually receive if your dog has a food allergy. Read more in Dasuquin ingredients explained.
When to stop and call your vet
- Vomiting or diarrhoea that lasts more than a day, or blood in either
- Your dog goes off their food or becomes lethargic
- Itching, hives, facial swelling or breathing trouble (call straight away)
- Your dog is on other medicines, is diabetic, pregnant or nursing, has pancreatitis or has a known food allergy
Any supplement can upset some dogs' stomachs, including ours. For more, read our general guide to joint supplement side effects in dogs.
Why Dasuquin customers switch to MedPaw
We'll be straight: MedPaw contains mollusc (green-lipped mussel) and gluten (brewer's yeast), and it's a chicken and bacon flavour chew, so it isn't the answer for every allergy. Where it differs is in how easy it is to give, what's in it and what happens if it doesn't suit.
Dasuquin vs MedPaw
| The issue | Dasuquin | MedPaw |
|---|---|---|
| If it doesn't suit your dog | No money-back guarantee we could find | 60 days from delivery, for any reason; email us and keep the tub |
| Format | Chewable tablet, often halved | Soft chew given like a treat; whole chews at every weight |
| Time on the loading dose | 4 to 6 weeks | Three weeks |
| What's in it | Glucosamine, chondroitin, ASU | All six key joint actives (glucosamine, chondroitin, MSM, green-lipped mussel, hyaluronic acid, Boswellia), with the main amounts per chew on the label |
| Allergens | No allergen statement; contains poultry and soy | Contains mollusc and gluten; not suitable for a shellfish allergy |
Our recommendation: if Dasuquin upset your dog's stomach, your dog won't take the tablets, or you want a guarantee before you try something new, switch to MedPaw, as long as your dog has no shellfish or gluten allergy. Wait until any upset has settled, then start MedPaw. If it doesn't suit, email bark@medpaw.co.uk within 60 days of delivery for a refund. Try MedPaw Hip & Joint Chews.
If nothing has worked so far
If your dog is still stiff or sore after a fair trial of any supplement, see your vet. They may suggest pain relief, weight loss or an omega-3 fish oil at a proper dose, which has the strongest evidence for dogs with arthritis. Read what you can safely give a dog for joint pain and the best fish oil for dogs' joints.
More on Dasuquin: MedPaw vs Dasuquin, why Dasuquin might not be working and our Dasuquin alternatives guide.
Does Dasuquin have side effects?
They're rarely reported. None of the seven UK reviews we read mentioned a side effect, and Protexin's page lists no warnings. As with any supplement, some dogs may get an upset stomach, loose stools or wind.
Can Dasuquin cause diarrhoea?
We didn't find any UK reviews mentioning diarrhoea, but any supplement can upset some dogs' stomachs. If your dog has diarrhoea for more than a day after starting Dasuquin, stop it and speak to your vet.
Does Dasuquin contain chicken or soy?
Protexin lists hydrolysed animal protein from poultry and avocado/soybean unsaponifiables (ASU), and some retailers also list soy lecithin and soya protein isolate. If your dog has a poultry or soy allergy, check with your vet before using it.
Is Dasuquin safe with my dog's medication?
Protexin's page doesn't cover medicines, and a US vet guide advises caution with blood thinners and diabetes medicines for Dasuquin Advanced. Check with your vet first, especially if your dog has pancreatitis or diabetes.
What should I try if Dasuquin upset my dog?
Let your dog's stomach settle first and speak to your vet if it doesn't. Then you could try MedPaw Hip & Joint Chews, a soft chew with all six key joint actives and a 60-day money-back guarantee. It contains mollusc and gluten, so it isn't suitable for dogs with a shellfish or gluten allergy.
Can I switch from Dasuquin to MedPaw straight away?
Yes, if your dog is well. Stop Dasuquin and start MedPaw the next day, and don't give both. If Dasuquin upset your dog's stomach, wait until it has settled first. Check with your vet if your dog takes any medication.
