And even if you're not a human, how would Facebook prove it?
And even if Facebook could prove that you are not human, what right do they have to deny you what they clearly claim is yours ("your" photos)?
First, if the terms of service didn't have any exclusion against a dog then absolutely yes it's reasonable to expect them to accommodate recovery when you do so.
Second, if the terms of service explicitly state that you own anything then is it reasonable that they deny you your owership? We're talking about HUMANS here. If a business states that you are not permitted to enter their building but you do so anyway, and in doing so you lost your wallet, then is it reasonable to expect them to return it to you? Yes it absofuckinglutely is. This is no different whatsoever.
Third, terms of services are not a contract because nobody reads them. A contract specifically requires that both parties understand and comprehend the terms of the contract. Websites provide services despite the fact that 99% of people do not understand the terms presented. You're deluding yourself if you think it's reasonable to think that everyone fully understands "Facebook is not a place for pictures of my dog".
Why shouldn't one crate an account for a dog?
Might seem silly to some and only have two followers but they have fun and it doesn't harm anyone.
I don't think FB actually has a fraud system outside of "wait a long time" so its not worth it to hackers.
If you haven't logged into the account or the email address long enough that the email address domain expired. Then that's poor planning and isn't necessarily a problem with Facebook. I'd say most of my online accounts that don't have 2FA would be difficult to reset passwords for if I lost access to my email account.
If I signed up to a Facebook account and put my dogs name on it, how would Facebook ever know who human the owner is?
Obviously you should routinely backup your data, yet here we are. Last year I noticed that most of the photo albums I shared on FB over the years just disappeared. They were not hidden by some app setting, nor temporarily unavailable, the data dump FB offers has no trace they even ever existed. The data was gone. I reported the issue but never got any answer. Thankfully I had the original photos on my old desktop. So when your data may randomly vanish, do backups, just my two cents.
You have to be careful how you use Facebook. I've gotten aggressive about blocking all from every single group and cute kitten post. Facebook is a great way to share pictures with my friends and family. For news, jokes, buying/selling, and learning about my hobbies it is useless (because the algorithm doesn't show me everything). As a rules, if it isn't something you wouldn't mark as personal information with limited distribution it shouldn't be on Facebook. (this also implies Facebook needs high security)