Both Quidco and Topcashback are currently offering £5.75 cashback on all orders at Itch Pet. Itch is a subscription service for flea and worming treatment for your pet. Its normally £6.50 per month for the subscription but you can take the free trial and pay only £1.99 P&P.
Cashback should track within 24 hours, and the subscription can be cancelled anytime. May just be worth leaving for a few days before you cancel though if you do not wish to continue the service. Set yourself a reminder if you don’t wish to continue.
All being well, you’ll make £3.75 profit plus some flea treatment for your pet!