Final answer:
Topical flea medication should be applied on the back of the neck or between the shoulder blades after disinfecting the area, and it is important to monitor for any adverse reactions.
Step-by-step explanation:
Topical flea medication should be applied to the skin typically on the back of the neck or between the shoulder blades, where pets cannot easily lick it off. It's important to disinfect the area thoroughly before application to prevent infection and ensure that the medication is absorbed properly. After application, monitor the site for any adverse reactions such as rashes or irritation. This form of treatment is commonly used for superficial skin infections like flea infestations.