Zoetis Learning Solutions has some excellent free CE courses available:
A Guide to Giardiasis: When to Test and When to Treat
Heartworm Disease in Dogs and Cats: Where Are We Now?
Canine Heartworm Disease: What we thought we knew…
Resistant Heartworm and the Comparative Efficacy of ProHeart 12
Demystifying Feline Heartworm Disease
FeLV: Understanding Pathogenesis, Diagnosis, and Prognosis
Tick Talk: Knowledge Worth Spreading
Simparica Trio: Broad Spectrum Protection Dogs Deserve
Simparica Trio Product Training Site (2 courses)
Additional Resources:
Top 5 Fine-Needle Biopsy Sample Collection & Handling Errors