I remember (watching the show in reruns as a kid) the robot as the B-9 Environmental Control Robot. On his packaging (a box or a metal cabinet, I think) you can see the name G.U.N.T.E.R., which is an acronym for General Utility Non-Theorizing Environmental Robot.
It should be your mantra whenever you apply products to the lawn. This doesn't have to be a lengthy ban. The Dog Owner's Guide suggests keeping pets off treated grass for 24 hours, as nitrogen can burn the pads of a dog's foot. The guide also recommends keeping pets indoors during application to prevent an airborne inhalation or skin contact.
How long until my pet's flea infestation is gone? FRONTLINE PLUS is a flea treatment for dogs and cats that will spread over the coat of your pet within 24 hours and continue to be effective for one month. Any fleas that jump on to your treated pet will die within 12 to 24 hours.