Crossroads Animal Hospital

123 Nashua Road
Londonderry, NH 03053


Flea and Tick Prevention

Fleas and ticks, pesky little things that they are, can be found year-round. Therefore, it is very important to keep your pets protected year-round. This page is dedicated to the different flea and tick preventatives we offer here at the hospital. Check out this video about the deer tick!

Prescription orders can be placed on our online pharmacy and delivered to your house OR you can fill out our Prescription Request form and pick your meds up in 24 business hours (please note our hours). 

Simparica Trio is a 3 in 1 monthly chewable! It's a preventative for heartworm, flea/tick, de-wormer (roundworms and hookworms) in one tasty chew! We strongly recommend heartworm and flea/tick prevention year-round. This is a prescription, so please call ahead for refills. 

Current offers: Zoetis now has a Petcare Rewards program. Check out for their current offers and to sign up! 

Simparica is a monthly chewable flea and tick treatment that is only safe for dogs. It is a liver flavored chew tablet and is available by prescription so please call ahead for a refill. We strongly recommend flea and tick control year-round. 

Current Offers: Zoetis now has a Petcare Rewards program. Check out for their current offers and to sign up! 

Frontline Gold is safe for both dogs and cats. It is a monthly topical flea and tick treatment. You can purchase this right in our hospital, over the counter. We strongly recommend flea and tick control year-round.

Current Offers: There are some rebates available: Buy 6 and get a $12 rebate. Buy 6 doses of Heartgard and 6 doses of Frontline Gold and receive a $20 rebate. These are all INSTANT REBATES that will be deducted from your invoice. All doses have to be for the same species, cannot combine dog and cat Frontline Gold to get the rebate. 

Available on our online pharmacy ONLY:

Seresto Collars for cats and dogs is a collar that kills and repels fleas and ticks and is worn for 8 continuous months of protection. This is an over-the-counter product, so you can come in any time to pick it up.

Current offers: While Seresto Collars can be purchased elsewhere, there is an online rebate when purchased here. You can visit for current rebate information.