Our approach to fleas and ticks is a bit controversial, but it has sure
worked for our dogs.  We feed them garlic in their food.  Once, we ran out,
and within a week they were all three covered with ticks (we were picking
off at least 20-30 a DAY).  Started them on it again, and within a week we
were back to one or two stray ticks a week.  No fleas, either (and this is
in a fairly high flea population area of TX).  We feed them garlic granules
(like you use in cooking).  About 1 T or a little more per day divided
between four dogs.

Sandra