I've been using Revolution for about 10 yrs now without a problem. even so my girls are not the out doorsie type my DH flies rc helicopters and airplanes and is alway outside and has been know to bring home a tick or two
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As a Vet tech I've seen to many babies have to go through treatment for HW and it's so hard on them not to mention how expensive it is.
Even if treated they may not survive. The treatment can kill them. So why take a chance.