The answer to this question is YES! Of course, that hinges on what flea collar you buy. Some flea collars are not as effective or as reliable as others and it is important to check out what your collar is capable of.
Some flea collars kill only adult fleas and some only kill young fleas. Then, there are collars like the Dewel flea and tick collar that kill all stages and also repel and kill other insects that could affect your pet as well.
We recommend that you carefully read and review all of the relative information before you purchase a flea collar.