Its been a bad year for fleas according to everyone I’ve talked to. Not sure if your dogs got fleas but I thought I'd let you in on something I'm using.....
Here is the link to what I buy....
http://www.epestsupply.com/cgi-bin/shopper.cgi?preadd=action&key=BAYERPREMISE
It is $69 for a 240 ml bottle. There website does not require a pest control license.
Since you use only 1 ml per dog the cost per treatment is 29 cents!
This is the EXACT chemical (Imidicloprid) in the dog flea treatment Advantage and is made by the same company Bayer. I've found it to work much better than Biospot, Frontline, Etc.
Just take a syringe (without needle) and apply 1 ml between the shoulder blades monthly.
I haven't seen 1 flea on my dogs since I started using this over a year ago
Toby