If you find fleas on cats and dogs, you need to deworm them immediately. You must go to a regular pet pharmacy to buy deworming drugs. Use deworming sprays and drops alternately. During this period, be sure to wear an Elizabethan ring on your pet to avoid poisoning from the drug by licking it. In addition, the dog’s living environment and used items must be thoroughly cleaned, disinfected, and exposed to the sun to prevent the occurrence of bacteria and parasites, which may affect the health of cats and dogs.