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			We use the Seresto Collar (~ $60 ea) with excellent results in tick-laden New England.  I have no experience with them in Mexico.  While they are expensive they report to last 8 months.  We now live in SC, use them year round and change them out every 6-months.  Well worth the expense in our opinion but I would certainly like to hear from other members including some of our members who are Veterinarians.
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