calliecritturs
Posted : 7/9/2008 9:01:53 AM
48 hours usually distributes but also remember you have to wait 2 days after the last bath to apply (so you may really have to 'forward plan';)
The other thing to remember -- in a year when it is really horrific, it kills on contact with the chemical (not instant contact either - it takes a bit of time but I don't know specifically). But if there are SO MANY fleas and ticks (like if they walk thru where there has been a hatching) you may see *tons* of parasites and think it's not working. It is, but it's just having to deal with sheer numbers of parasites.
It's not like the old Raid commercial where the bug screams "RAIIIIDDDD" and then flips over on its back. Sometimes people think when they SEE fleas on the dog that it's not working. There can be a resistance to Fipronil but usually it's not so much as real resistance but rather that there are just SO MANY pests that it takes a while for them to die.
If you're using the "Plus" then even if a pregnant flea manages to lay eggs, those eggs won't develop into viable babies because they won't be able to form that outer shell that fleas require to sustain life.
According to my vet it's not "the best" to reapply within a month but it's not injurious to do so. I also use the Frontline Spray and he's told me I can do that every 2 weeks if truly warranted on an occasional basis.