You could always try the ...
" I kept it in all night ready to be fetched in and would you belive the little critter ran through my legs as I was going through the door :shock:
I wont see him again until bed time now, and the fleas are hopping all over the place - please can I have some frontline so I can deal with him as soon as he gets home
Give your local vet a ring you never know they might help
Edit : Not that I've ever done the above you understand