Verdict: In moderation
Mango flesh is generally safe for dogs in moderation, offering vitamins and fiber. However, the pit is a serious choking hazard and can cause intestinal obstruction, potentially requiring emergency surgery. The skin, while not toxic, is difficult to digest and contains urushiol-like compounds that can cause irritation.
Cyanogenic glycosides in the pit can release cyanide when chewed or digested, though typically in small amounts. Urushiol-like compounds in the skin can cause contact dermatitis. The pit also poses a significant mechanical obstruction risk.
Cyanogenic glycosides (in pit), Urushiol-like compounds (in skin)