sheisraging:

I’m re-posting this because of that shit-show post that got wrecked due to mis-information and because I care deeply about Senior Dogs, who have far fewer chances out there and deserve any visibility they can get without being labeled a red-ex scam.

This is legitimate. 

Both URLs you have seen belong to Old Friends Senior Dog Sanctuary. 

If you’re uncomfortable with the URLs, you can donate via the link on Facebook: https://www.facebook.com/OldFriendsSeniorDogSanctuary/

Or their website, as stated, both URLs work:
http://oldfriendsseniordogs.com/index.html
http://ofsds.org/index.html

For reference:

It is NOT uncommon for Non-Profs. (or any company) to own more than one domain name (abbreviated and non) and redirect all to one place or clone their sites in order to serve as catch-alls and attempt to grab more traffic (often people just assume a full name is their url or an abbreviation is their url, sometimes only one is available at the time of purchase and they grab the other one later on). Regardless, the more traffic/visibility, the more chance of donation, which is how they survive.