Single suspected wasp sting tied to hemolytic anemia in a dog

A new case report in the Journal of Veterinary Emergency and Critical Care describes a 3-year-old Yorkshire Terrier that developed hemolytic anemia after a suspected single wasp sting, with hemoglobinuria appearing about 4 hours after the event and remission achieved after glucocorticoid therapy and IV treatment. The authors point to mastoparan, a major wasp venom peptide, as a plausible trigger, and their in vitro work suggests canine plasma may partially inhibit mastoparan-induced hemolysis. That matters because severe toxic effects from hymenoptera stings in dogs are more often associated with multiple stings, while this report raises the possibility that even a single sting could, in rare cases, contribute to clinically important hemolysis. (eurekamag.com)

Why it matters: For veterinary teams, the report broadens the differential list when a dog presents with acute pigmenturia, anemia, or signs of intravascular hemolysis after an outdoor exposure. Earlier veterinary literature has linked bee envenomation with secondary immune-mediated hemolytic anemia, and other canine case reports have documented severe systemic injury after wasp stings, but this case adds a more specific mechanistic suspect in mastoparan and highlights that a low-sting burden may not rule out toxin-related hemolysis. (pubmed.ncbi.nlm.nih.gov)

What to watch: Whether additional case reports or experimental studies confirm how often single-sting wasp exposure can cause hemolysis in dogs, and which patients may be most vulnerable. (eurekamag.com)