[quote="judy"]It has to dry, so it depends on the humidity. A few hours, generally. After a few hours, the treatment is waterproof, so the dog can go swimming, have a bath, etc., and he's still protected.Originally Posted by Moviedust
The difference between Frontline and Frontline plus has more to do with the flea life cycle, I think. Frontline Plus also kills flea larva and eggs, whereas Frontline doesnt.
You can check out more information about Frontline products at their website. Just like you would for homeopathic meds, you can research these products and find out all the details before you use them.
Here you go: http://frontline.us.merial.com/home/index.asp
There are is also a lot of information online that isnt from the company. A quick search will give you a lot. You might want to even look for old threads on these discussion boards.