Akita vs Rhodesian Ridgeback

The AKC's own breed standard warns that Akitas 'may be intolerant of other dogs, particularly of the same sex' — that's not a rare temperament quirk, it's written into the official standard, and it's a major reason the breed is refused or surcharged by roughly 4 in 5 home-insurance breed-restriction lists.

The 'ridge' that defines this breed's whole identity is genetically linked to dermoid sinus, a birth-defect tube of skin tissue that can run from the surface down toward the spinal cord and usually has to be surgically removed — the breed's own US club says it's unlikely the defect will ever be fully bred out.