The 2026 AAHA One Health Guidelines: Emerging Concerns in Canine and Feline Parasitology address 12 emerging parasites of greatest concern in companion animals, along with nine additional parasites of potential concern. The free resource provides practical recommendations for recognition, diagnostic testing, treatment and client education.

The guidelines identify four key drivers of parasite emergence: increased antiparasitic drug use and resistance, environmental and host changes, greater animal movement and interaction, and improved detection through surveillance and diagnostic technologies.

Recommendations encourage veterinary teams to adopt a One Health approach to parasite monitoring and management, apply antiparasitic drug stewardship principles, recognize potentially reportable diseases and select appropriate diagnostic tests. The guidelines also address zoonotic risks and when veterinary professionals should contact public health or other appropriate officials.

Co-chair Kathryn Duncan, DVM, PhD, DACVM (Parasitology), emphasized that parasite control requires a multimodal approach rather than a single solution, including effective communication with clients.

Co-chair Jason Stull, VMD, MPVM, PhD, DACVPM, highlighted the guidelines’ focus on discussing disease risks to both people and pets, as well as addressing client concerns and barriers to antiparasitic drug use, including medication hesitancy.

For more information, visit the AAHA website.