HomeDogJohnsons Larger Dogs One Dose WormerJohnson's One Dose Wormer Tablets Size 3 For Larger Dogs 4 Packby Johnson's 14 reviewsPets Club Price100% progress of 100%Product detailsPets Club PricePack Size4 PackRegular price£9.00(£2.25/Unit)Pets ClubPets Club Offer3 for 203 for 2 on selected Flea, Tick & Worm*Pets Club. Free to join, easy to saveUnlock exclusive Pets Club prices and offers - Find out more10% off your first shop, plus hand-picked rewardsSign in/ Sign upQuantityAdd to basketLoading...Click & CollectLoading...Loading...Loading...Home DeliveryLoading...Loading...Frequently bought togetherLoading...Loading...Loading...Loading...Loading...Loading...Loading...pdp-dog-medicalProduct descriptionSingle dose remedy eliminates both roundworms and tapeworms in larger breed dogs, includes 4x500mg tablets.Single dose treatmentKills roundworms & tapewormsContains 4x500mg tabletsDue to changes in legislation, we are unable to send this item to Northern Ireland. An alternative product may be available in one of our stores.Johnson's One Dose Wormer for Dogs 500mg Size 3 is a single dose treatment to kill both roundworms and tapeworms in larger breed adult dogs.Contains 4x500mg tablets.Suitable for: Dogs and Puppies over 12 weeks of age - minimum weight 8kg (17.6lb).Not suitable for: CatsApproximate Dimensions (Product):4 Pack: H8.2 x W7.2 x D2.5cm Product code: 8367Read moreAbout the brandA British family company caring for the nation's pets since 1921. Johnson’s have been providing their leading range of pet healthcare products for over 100 years, and continue to develop new products and new treatments we need for the pets we love.IngredientsCompositionContains NitroscanateCare and safetyProduct Care: Store in a dry place. Do not store above 25C.Warnings and Safety: This product can be an irritant to the skin and eyes. Keep out of the sight and reach of children. Keep the blister in the outer carton. Dispose of empty packaging and any remaining product in accordance with local requirements.Regulatory Information: Registered internet retailer of veterinary medicines This product belongs within the animal medicines legal category of AVM-GSL (Authorised Veterinary Medicine – General Sales List). Johnsons Larger Dogs One Dose Wormer- Marketing Authorisation Number - VM 11990/4028Secretary of State for Environment, Food and Rural Affairs, House of Commons, London, SW1A 0AAInstructionsHow to use:Give the required number of tables first thing in the morning when your dog's stomach is empty, with about one fifith of their daily food ration. The tablets should be given whole. Tablets are film-coated and should not be broken or divided.The dose of the product for the treatment of adult dogs is nitroscanate 50mg/kg bodyweight, which is equivalent to 1 x 500mg tablet per 10kg (22lb) bodyweight. Repeat this treatment every three to six months as a preventative measure. Follow the dosage chart below:Dog WeightExample BreedNumber of Tablets8 kgs - 10 kgs (17.6 lbs - 22 lbs)Scottish Terrier110.1 kgs - 20 kgs (22.1 lbs - 44 lbs)Springer Spaniel220.1 kgs - 30 kgs (44.01 lbs - 66 lbs)Labrador3For dogs weighing over 30kg (66lb) additional packs will be required. Give an additional tablet for every extra 10kg (22lb) in weight. For dogs weighing less than 6kg (13.2lb) use Johnson's One Dose Wormer for Puppies & Small Dogs 100mg Film Coated Tablets.Offer Terms & Conditions3 for 2 on selected Flea, Tick & WormThe promotion is available in Pets at Home stores & onlineThis promotion is valid until midnight on 14th July 2026Pets Club Prices and Offers are available only to Pets Club members. Not available on guest checkout. Sign into your account to redeem. T&Cs apply.Full Terms & Conditions applyReviews