HTTP Dog vs RandomFox

http.dog serves a themed dog photo for most standard HTTP status codes (e.g. GET /200, /404, /451), following the same status-code-as-image idea as http.cat. A .json variant returns direct links to the same image in JPEG, WebP, AVIF, and JXL instead of the image itself. It's a static Cloudflare-fronted site with no server-side application logic, so there's no API key, authentication, or rate limit of any kind.

RandomFox.ca returns a JSON object with a direct image URL and a shareable link to a random fox photo drawn from a community-submitted collection. It's a free, keyless hobby project with no published rate limit or pricing tier.