What is the approximate annual spending on dog heartworm prevention?

• A. $1.2 Billion
• B. $12 Million
• C. $120 Billion
• D. $2.4 Billion

Answer: (A)

Estimation hinges on two factors: how many dogs are on heartworm prevention and how much it costs per dog each year. In the U.S., there are tens of millions of dogs kept on prevention, and the yearly cost per dog is typically in the tens to low hundreds of dollars, depending on the product. Multiply a few dozen million dogs by roughly a few dozen dollars per year, and you land in the low to mid billions. A figure around 1.2 billion is a reasonable approximation of annual spending, since it fits that range when you consider actual usage and price variation. The other numbers don’t align with the likely combination of the dog population on prevention and typical annual costs: it’s far too small to cover so many dogs, and it’s not so large as to exceed what most households and clinics would spend on routine prophylaxis.