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You can break open a vial of frontline and pour it into a disposable container or a spoon. Then draw up a measured dose into a syringe and administer it to the smaller dogs.
The recommended dosages are:
0-22 lbs 0.70 ml22-44 lbs 1.4 ml45-88 lbs 2.7 ml89-132 lbs 4.0 ml
This info came from my vet so if you have any concerns about this, be sure and talk to your vet before you use it. We buy the largest dog size every month and use it to treat 9 dogs instead of three. It's a big cost savings for us.
Let me know if you still have questions.