Interceptor, its made 2-10 lbs. It's the only one that actually states a size this small. Heartworm prevention is one of the best investments to make with your yorkie. They are both good, as long as you give it like clockwork. Any one of them will be effective. I've never seen or heard of any issues from this one of Heatguard.
Even if they don't live in a place that people think are exempt, like they use potty pads. Give them the medication. It's not worth the risk.
Boys 6-7 months. No longer
Girls this is trickier because you fight the clock to do it. 9 months. You want to get it done before they go into season.
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