Will Falconer, DVM Moderator
Hey Sara,
I rarely see AIHA as "causeless" or "unknown," though, to be fair, I see very little of it these days. Odds are very high that, within a month prior, she had either: 1. A heartworm pill or 2. a vaccination.
These two are the commonest triggers, and now that combo wombo HW/Flea pills and spot ons are coming out, we'll likely see more coming from those treatments as well. Bravecto seriously scares me.