How does FirstAct Plus differ from vet-prescription spot-ons?

It uses the same two-part approach, an adulticide plus an insect growth regulator, but it is an over-the-counter brand rather than a vet-channel product. Vet brands are backed by more published trial data and often add a second adulticide.

Can I use it on puppies?

Only on dogs within the labeled age and weight for this mini size. Puppies below the minimum age should not be treated with it, and a vet should advise on any dog that is pregnant, nursing or on other medication.

How often do I apply it?

Once a month. Apply to dry skin between the shoulder blades, keep the dog from licking the spot until it dries, and do not bathe the dog for a couple of days before or after.

Will it stop fleas in my house?

It stops fleas on the dog from reproducing, which breaks the cycle over time, but existing eggs and larvae in bedding and carpets survive. Wash bedding and vacuum regularly, and expect several months before an infestation clears.

No. It kills ticks after they attach and contact the treated coat, so it is not a repellent. Check the dog after walks in tall grass and remove attached ticks promptly.

Can I use it with other flea products?

Avoid stacking another topical or oral flea product on the same dog without veterinary advice, since the active ingredients can overlap. Treat other pets in the home with a product suited to their weight and species.