IMO, there is no way a 2lb dog eating a half cup of kibble a day should look really skinny, but maybe that's just me. All you can do is add calories (any reason you can't mix it with canned)? But I personally would want to know just why. My first thought in a pup is that the worms weren't cleared, but that probably isn't the case, esp. since Heartgard Plus controls rounds and hooks.
I would hope nobody takes what I say over what a vet says, but I would not split any heartworm drug.
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