>>I want to ask, what tests do you need to see whether or not they're infected? A blood test?
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Yes, a blood test. My vet does a scanning tick disease blood test with the heartworm blood check. If a tick disease value comes in high, then he does a more detailed blood test for that specific disease. There are also symptoms to watch for in your dogs. Sometimes a blood test will fail to show the disease, but it is there.
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Kathy Diamond Davis, author, "Therapy Dogs: Training Your Dog to Reach Others," 2nd edition, and the free Canine Behavior Series articles at http://www.veterinarypartner.com/Content.plx?P=SRC&S=1&SourceID=47