Canine Heartworm Protocol Guide

Use this guide to keep the main parts of canine heartworm care organized: the treatment sequence, the points where cases often drift, and the follow-up needed when prevention has been missed or delayed.

Published June 2026 / Last updated June 2026 / Educational resource

Smart protocols

Open the treatment workflow in Vetool

The Canine Heartworm Protocol gives you a dated place to organize the adulticide workflow, follow-up points, and case notes while you work through the plan.

Open the Canine Heartworm Protocol

Keep the treatment sequence visible

Heartworm cases can become difficult when dates, reassessments, and handoffs are tracked in separate places. Start by keeping the case stage, treatment plan, and next check visible to the whole team.

Step 1

Confirm and stage the case

Use the diagnostic and staging work that fits the patient before building the plan. The workflow changes when the dog is unstable, has marked clinical disease, or needs additional risk assessment.

Step 2

Map the pre-adulticide period

Record the intended restriction, preventive, and pre-treatment steps in one place so the team can see what has already happened and what still needs scheduling.

Step 3

Schedule adulticide milestones

Track adulticide milestones as dated items. Put each milestone, client instruction, and follow-up contact on the timeline.

Step 4

Plan reassessment points

Build in checks for clinical status, client adherence, and any delay that could change the next step. A small missed date can affect the rest of the plan.

Step 5

Close the loop after treatment

Keep post-treatment follow-up and prevention planning attached to the case. After the last injection, the dog still needs a clear prevention and testing plan.

Where cases usually drift

The common problem is not a missing guideline. It is a plan that becomes less clear after a delay, a handoff, or an incomplete prevention history.

Clinical risk changes

Pause when signs worsen, the dog cannot tolerate the planned pace, or the case no longer fits the standard path.

Dates move

Recheck the plan when a visit, medication, or client instruction is delayed. The next step should come from the updated timeline.

Prevention history is incomplete

Treat missed or delayed prevention as its own follow-up question. The testing plan depends on what was missed and when.

When prevention has been missed or delayed

A prevention gap is a different problem from a confirmed treatment case. First clarify the date of the last on-time dose, what product was used, and whether any testing has already been done.

Start with the timeline

Record when prevention was last given on schedule and when the gap was noticed. Vague timing makes follow-up harder.

Separate overdue prevention from confirmed disease

A missed dose does not automatically mean the dog is infected, but it does create a follow-up plan that should not be left to memory.

Set the next testing point

Use current guidance and local practice standards to decide what testing is needed now and what should be repeated later.

Need the workflow in the app?

Open the Canine Heartworm Protocol when you are planning treatment. Use the Prevention Gap tool when the question starts with missed or delayed prevention.

Open the Canine Heartworm Protocol

References

  • Current Canine Guidelines for the Prevention, Diagnosis, and Management of Heartworm Infection in Dogs, American Heartworm Society. AHS canine guidelines
  • Canine Guidelines Highlights, American Heartworm Society. AHS canine highlights

Disclaimer

For veterinary professional education and workflow support only. This page does not replace clinical judgment, local regulations, product labeling, or current veterinary references.