Hello,Customer thank you for your question tonight.
You ask a great question--there are so many flea products out there right now and it can be confusing to know what to use at what ages. I am pasting below a table that lists the various veterinary flea products and how early they can be used. If you have an active flea problem and are actually seeing fleas, I would recommend a topical product such as frontline, revolution or advantix to take care of the adult fleas. These products are repeated monthly or every other month for best effectiveness. It is also extremely important to treat the environment appropriately to kill the other life stages.
Here is the table:
Confused about flea protection? This FAQ compares all the currently available flea control products to assist you in determining which is right for your situation. These products are available at licensed veterinary hospitals. These tales do not include over-the-counter products (as would be sold in a grocery or pet supply store.
Table 1: Flea killing ingredient; flea sterilizing or additional ingredients; for dogs or cats; youngest age or size approved for use; waterproof or water resistant
Table 2: Approved for pregnancy or lactation (nursing); how long until maximum effect against fleas is reached; other parasites killed, controlled or repelled; how often applied or administered
Table 3: Oral or topical, prescription drug, non-prescription drug or insecticide; ld50 (lethal dose to 50% of the population)
Table 4: Year first made available in U.S.; manufacturer and link to manufacturer's website; additional cautions
Flea Killing Ingredient
Flea Sterilizing orAdditional Ingredients
For Dogsor Cats
Youngest Age or SizeApproved For Use
Waterproof orWater Resistant
14 weeks; at least 5 lbs
pyriproxyfen (flea sterilizer)
7 weeks;at least 2.5 lbs
amitraz (for additional parasites)
dog or cat
6 weeks puppies8 weeks kittens
7 weeks puppies8 weeks kittens
Advantage Multialso called Advocate
moxidectin(for additional parasites)
7 weeks puppies9 weeks kittens
methoprene (flea sterilizer)
lufenuron (flea sterilizer)
lufenuron (flea sterilizer) &milbemycin (for add'l parasites)
4 weeks; at least 2 lbs
YOu can see that almost all of the products are safe for 8 week old puppies.
Here is some additional information on flea control:
I hope this information is helpful. Visit your local vet office to purchase these type of products. Thank you so much!
I was not able to see the end comments to your original post until now.
You should also treat your other dog. Due to the various life stages of fleas living in the environment, your other dog has already been exposed and needs to also be treated to get rid of the flea problem.
I hope this helps! Let me know if you have any questions.