Killing an infestation of fleas on your pet may not solve your flea problem if you allow your pet free access to the lawn and the lawn itself harbours the tiny pests. Each time your pet ventures onto the garden a new crop of fleas will infest your animal. The trick is to rid your lawn of fleas at the same time that you kill them on your pet. A simple spray made with Dawn washing up liquid is all that most homeowners need to rid their garden and pet of troublesome fleas.
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Mow your lawn
Mow your lawn to a height of 3.7 to 5 cm (1 1/2 to 2 inches). This allows sunlight to heat the ground -- killing flea eggs -- and will allow sprays to reach the ground where fleas and their eggs live.
Fill a lawn sprayer with water -- this is the same type of hand-held sprayer that you would use for applying insecticides or weed sprays. Add 28 g (1 oz) of Dawn washing up liquid.
Spray in the evening
Spray your entire garden with the Dawn washing up liquid and water mixture in the late evening, allowing the detergent to do its job for several hours before the sun rises and dries the soapy water, reducing its effectiveness.
Check your results
Check your lawn for fleas the following morning. If no fleas are found, water your lawn thoroughly to keep the grass roots moist. If fleas are still present, repeat your spraying that evening. By the next morning all fleas should be gone from your yard and you can begin watering in order to prevent the grass roots from drying out.
Repeat as necessary
Repeat spraying your entire garden approximately 10 to 12 days after the first spraying. This will allow flea eggs that were present during your first spraying to hatch and allow you to kill the next batch of fleas. Inspect your garden every 10 to 12 days and repeat spraying with Dawn as necessary to maintain a flea-free lawn.