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Originally Posted by EarthAngel  I have a question as to why I need to have the heartworm test done once a year when my Yorkie who is 1 yr. 5 mos. old and a Boxer who is 1 yr. old have been on it since they were able to get it? I still have no idea why they need to get retested before getting their next prescription of Heartguard. If anyone can tell me I'd appreciate it. |
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No drug is 100% effective. So it's always possible that it isn't working for whatever reason or that the dog is split is out when going outside, etc.
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I think some of it could be a CYA thing, too. How many pet owners say they are giving it regularly, but don't?