Beaphar Dog Flea Shampoo should be used in dogs over 12 weeks old. It is simply mixed with lukewarm water and massaged into your dogs coat to produce a lather. Then rinse and repeat towel and brush and comb through thoroughly. Repeat in 7 days if should be necessary. Not to be used for dogs who are feeding puppies or cats. Do not use if using any other insecticides. Quantity guidelines on reverse of bottle 250ml