If you've started comparing flea and tick preventives, you've probably noticed the prices don't line up the way you'd expect. A one-month pack might cost $35, while a six-month pack of the same product costs $170. Is the six-month pack really almost five times the price? Not quite — and the math matters.
Compare cost per month, not the price tag
The only fair way to compare two products, or two pack sizes of the same product, is cost per month of protection. A $35 one-month pack and a $170 six-month pack both work out to roughly the same monthly cost — the six-month pack usually ends up slightly cheaper once you do the division. Retailers know most shoppers compare sticker prices, not monthly cost, which is exactly why this gap exists.
Match the product to your dog's actual weight
Every flea and tick chew is dosed by weight band, and getting this wrong matters more than brand loyalty. A product that's perfect for a 40-pound dog can underdose a 70-pound dog or overdose a 15-pound one. If your dog is near a weight-band boundary, that's a conversation for your vet, not a guess.
Prescription vs. over-the-counter
Products like NexGard, Bravecto, and Simparica Trio require a veterinary prescription in the US. That's not a sales tactic — it reflects that these are genuine pharmaceuticals with real dosing and safety considerations, not a topical spray. A prescription also means a vet has signed off that the product is appropriate for your specific dog.
Autoship discounts are usually worth it — if you'll actually use it monthly
Most pharmacies offer 5-15% off when you set up a recurring order. If you're going to buy the same product every month or every few months anyway, that's a straightforward savings. It's only a bad deal if you end up with product sitting unused because your dog's needs changed.
The bottom line
Price, weight band, and supply length are the three things to check together — not price alone. Compare current options by cost per month, for your dog's actual weight, across multiple pharmacies before you buy.