The topical dog flea formula is the same for large and small dogs - only the amount is different, the price is the same! So I take one for large dogs, apply as much as the small dog pack says, and store the rest in one of those bottles for the next month. If you store them upright, no problem. However, mine fell into the box and leaked even though it was tightly closed. What you should consider depending on the intended use.
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