All of the above things probably will work but actually if you will put 1 cc of admire on the hounds once every two months, you will NEVER have fleas again. However it must be done properly and that is you must get the admire to the skin not just on the hair. When a flea bites a hound with admire in his system, he is a dead flea!!!!! The first time you put the admire on it may take 6 to 7 days for all the fleas to be gone because there will be some hatching out every day for the next 7 days but then it is all over for good. Spraying is not necessary but it does help to hurry the process up, but as I originally stated, 1 cc on each hound every two months will eliminate your flea problem for good!!!!!!!