06/22/2026
Heartworm! We see more heartworm cases each year. This video shows microfilaria (baby heartworms) that circulate in the dogs blood. This is a blood smear we made from our patient and it tells us here is an established adult heartworm infection (and the adult heartworms are reproducing). This also means this patient is a “reservoir” and as new mosquitos bite they will acquire the baby heartworm which will mature into “infective stage” larvae and can transmit heartworm to another dog. Heartworm disease affects dogs, (less often cats, ferrets), wolves, coyotes, foxes, *sea lions* (and rarely humans)
*this* is why we recommend monthly heartworm preventative like Heartgard!!
The American Heartworm Society has a lot of great info:
https://www.heartwormsociety.org/