If, despite your best efforts at control, you find that fleas or ticks have crawled (or jumped) on board your pet, you will have to use a product that will kill and/or repel the parasites. These include once-a-month topical treatments, sprays, powders, dips, shampoos, collars and, to combat fleas, oral or injectable medication. Once again, you should ask your veterinary surgeon for advice about what the most appropriate product for your pet is. And remember, it is perfectly normal to see live fleas or ticks on a pet immediately after a topical treatment, spray, shampoo, collar, etc. is applied. Many believe that this means the product is not working, but the fleas or ticks have to fully absorb the product before they will be affected, which may take from a few hours to a few days.