Is important to note that there are yearly reports of deaths of cattle, horses, dogs, cats, rabbits, etc. from the topical, oral and intravenous use of ivermectin (two of which are included here) (FDA) (FDA) . It is not known, but expected, that these deaths may be the result of incorrect dose or use.
In Dogs specially Poms and other small breeds slightly higher dosages have shown cases of heart attach
Ref: http://www.guinealynx.info/ive rmectin.html#top