Fleas do not wait for a convenient month, and a treatment sold by size rather than by a precise dose is only useful if you actually know which size dog you are buying it for.

This is a spot-on treatment for very large dogs, applied with a pipette to a parted patch of fur at the base of the neck. It contains 402mg of Fipronil and is described by the manufacturer as giving four weeks of protection against fleas and against ticks, including Ixodes Ricinus.

• Spot-on flea and tick treatment for very large dogs
• Contains 402mg Fipronil
• Applied via pipette at the base of the neck
• Manufacturer states four weeks of protection
• Single treatment pack (x1)

A limitation worth flagging. No weight range is given for what counts as a "very large dog" on this card, so check the packaging itself or a vet before buying by size name alone. Keep children and other animals away from the treated dog until the application has dried, which is the manufacturer's own instruction, and always read the leaflet in the box before use.

Who it's for: owners of a very large dog wanting a monthly spot-on flea and tick treatment, applying a single pipette rather than buying a multipack.