Heartworm Prevention For Dogs Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Frontline is the best-performing heartworm prevention for dogs brand in July 2026, moving 30,000 units across 2 ASINs for 27.5% of Top 10 volume. PetArmor follows with 30,000 units (27.5%), ahead of Seresto on 20,000 units (18.3%).

With 5 brands splitting the Top 10 and 73.4% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $25.38 to $83.94, which frames the price band a competing listing has to justify.

Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, one ASIN forced its way in: B00N7DEBN4 booked 9K units at $35.68, with ▲ 0.0% MoM change. On the growth side, B0080B193I leads positive momentum with ▲ 125.0% MoM growth on 900 units, with B0B5HS8M6B close behind at ▲ 100.0% MoM on 4K units.

The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.