Go to way back see all the other sites that are linked mentioned eg products, domain, industries with branding.
Some will link to own sites they may have been sold it may give you more of an idea. Search that information on it's own. Search domains sold or reviews on services associated with those other emails. Think then reverse phone email databases these have been freely available. So what if i know your dog name. -57 is about where my help stops only noticed after post.