Crossroads Animal Hospital

123 Nashua Road
Londonderry, NH 03053

(603)437-1010

crossroadsanimal-hospital.com

ProHeart 6 is a 6-month injection used for Heartworm prevention. It is used in dogs only. Being an injection, an appointment is necessary for administration.  We strongly recommend Heartworm prevention year-round.

Current offers: Combine one 6-month injection of ProHeart 6 with 6 months of Simparica (flea and tick prevention), receive a $20 rebate. Combine one 6-month injection of ProHeart 6 with 12 months of Simparica, receive a $45 rebate. We will submit your rebate online for you! 


Heartgard is a chewable heartworm preventative for both dogs and cats. It is a monthly treatment and recommended for year-round use. It helps to prevent heartworm disease (transmitted by mosquitos) and also helps to prevent roundworm and hookworm infections. This is a prescription, so please call ahead for refills.

Current Offers: If you buy 12 doses of Heartgard, there is a $12 mail-in rebate. Also, if you buy 12 doses of Heartgard and 6 doses of Nexgard there is a $25 mail-in rebate. If you buy 12 doses of Heartgard and 12 doses of flea and tick prevention (Frontline or Nexgard) there is a $50 mail-in rebate. You will fill out the rebate form in hospital and we will mail it in for you. All doses have to be the same size.

Revolution for Cats and Dogs is a topical heartworm, flea and American dog tick preventative. It can also be used to treat ear mites and sarcoptic mange (scabies). It is a monthly treatment and it's recommended to be used year-round. This is a prescription, so please call ahead for refills. (Click on the logo to be redirected to the Revolution for dogs website. If you are looking for the information for cats, there is a link on the top of that page that will redirect you to the Revolution for cats website.) 

Current offers: If you buy 6 doses, you get 2 free. If you buy 9 doses, you get 3 free. All doses have to be the same size.