Acute renal failure following Bull ant mass envenomation in two dogs.

Acute renal failure was diagnosed in a German Short Haired Pointer bitch and a Kelpie cross-bred dog following envenomation by Bull ants. Both dogs had been tethered over a Bull ant nest and had experienced mass envenomation. There was local reaction at the envenomation sites and each dog had experienced vomiting that was poorly controlled by symptomatic therapy. Intensive treatment of renal failure was successful in the German Short Haired Pointer and the bitch remains well 19 months after envenomation. The Kelpie cross-bred deteriorated despite intensive treatment and was euthanased 36 hours after presentation. Necropsy examination revealed haemorrhage and necrosis of the small intestine and myocardium, bilateral nephrosis with tubular necrosis, and patchy haemorrhage of the lung alveoli, pancreas and adrenal cortices. Electron microscopy revealed necrosis of the small intestine and hydropic swelling of proximal renal tubules with necrosis of medullary tubules.