Read the following paragraph and determine if the hypothesis is true:

How to kill fleas on dogs<br>Wash your dog with flea and tick shampoo. While normal dog shampoo and dish detergent usually kill fleas, if you need something more potent, you could try a special flea and tick shampoo. [substeps] Read the shampoo label carefully to determine the proper way to use the shampoo for your dog.

Hypothesis: you have to do it multiple times
It's impossible to say