Will Falconer, DVM Moderator
Truly a sad story, Karen. I get the sense that, like Sesame in this article, the toxic load kills before the liver enzymes or kidney values have a chance to show something is amiss.
It would seem this combo of spinosad and milbemycin is above average on the toxicity scale, and yet leaves the victims with little physical evidence of what killed them.
I wish you all the best. You'll surely make different decisions now for all the other dogs who come into your care, and we have Nevah to thank for that.