I would only buy flea preventatives from your vet. There are certain brands that CANNOT be used safely on all breeds of dogs, which the vets should know. Buying from a pet store or online can be dangerous if you don't know exactly what to look for.
As an example, 2 of our dogs could use Trifexis (spelling???) but Phoenix cannot - it induces seizures in dogs who have had any seizures at all before. Collies cannot safely use Advantage Multi because of complications /side effects caused by the MDR1 gene, without having first been tested clear of this gene, and even then it is a risk.
And most definitely, as Laurie said - you have to treat the premises as well as the animal(s), or you'll just have the same flea problem over and over again.
A truly happy person is one who can enjoy the scenery on a detour.
Don't cry because it is over, smile because it happened!
"Aim small, miss small"
Mel Gibson, in the movie "The Patriot"
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