Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
I checked out the reviews for this on other websites prior to buying and found some awful ones but, as finding an all in one wormer that includes hydatid and heart worm seems actually quite difficult I thought I'd give it a try. Plus, the company is well known so you wouldn't think they'd sell anything dodgy! Turns out the product seems fine. I have a large collie that weighs about 25kg and a 6 month old pup at 12kg so was able to treat them both with one pack (one chew per 10kg). Because they thought it was a treat and therefore a competition they both scoffed them down without realising what it is was. No ill effects in either dog and its now 5 days after treatment. Seems a good product for a great price. Please click "helpful" if you find my review helped you and your dog/s :)