[Shawna]

That’s wonderful that the Vetco vet was able to give you some more useful information!! I agree, would have been nice to know earlier.

Thanks Cyndi 🙂 I found some more of him that I put on disk but forgot the cd at home. His new owner changed his name from Biscuit to Yoda. Not sure where Biscuit came from but he needed to be a Taz or Turbo or something more like that. 🙂

From what I’ve read, Ivermectin is still quite effective beyond the 30 days. I had the following printed out and in my pile of papers to read at home. Was cleaning in an attempt to find Kipee and Tumbleweeds birth dates. Anyhoo, the data dated 2013 reads
“For Heartgard-30 (Merial, Duluth, GA), the target was simply heartworm prevention. According to the original new animal drug application (NADA), 1 “of the 83 dogs treated at monthly intervals in natural infection trials, or treated 30 days after induced infection, with doses of ivermectin at 3.0 mcg/kg or greater, only 2 dogs developed infections. [Author’s note: The 2 dogs that were positive were dogs that had each received 3.0 mcg/kg on day 30 after having been infected with approximately 50 L3.] Even when the treatment interval was extended to 45 or 60 days following infection, only 2 of 88 dogs given ivermectin at 6.0 mcg/kg or more developed infections.” 1 Dogs receiving 6 mcg/kg at 45 and 60 days were negative at necropsy. Thus, the minimum effective dose of 6.0 mcg/kg monthly was chosen.”

Here’s what they say about Advantage Multi
“For Advantage Multi for Dogs (Bayer Animal Health, Shawnee Mission, KS), 6 the dosage was chosen based on an established minimum effective dose for moxidectin against intestinal nematodes. It was shown, however, that 2.5 mg moxidectin/kg protected all 44 dogs treated 33 to 34 days after inoculation and 12 dogs treated 45 days after inoculation.” http://www.wvc.org/images/session_notes_2013/2013_S3D.pdf

Treating every 35 days with Heartgard, as you did, should have been more than sufficient unless the worms were already there or a resistant strain.

• This reply was modified 10 years, 11 months ago by Shawna.
• This reply was modified 10 years, 11 months ago by Shawna.