Bob Martin's FleaClear Spot On for Large Dogs provides protection from fleas for up to 8 weeks and ticks for 4. Simply 'spot on' at the back of the neck, between the shoulders to start the treatment. It even includes a handy sticker to remind you when to treat your dog next time. FleaClear Spot On for Large Dogs can be used on dogs over 2 months old, between 20-40kg. Got cats? Don't worry - it's suitable for households with both cats and dogs. Make sure you treat other pets with appropriate products and give your pet's bedding a good hoover to effectively treat the problem. Always read the in-packet information before use to protect yourself and your pet. Suitable for the following fully grown dogs and similar breeds: Labrador, Retriever, Collie, Dalmation.