Shelters and adoption groups wouldn't be able to operate without donations. No matter if it's money (and, literally, any amount helps), food, harnesses, leashes, coats – everything is highly appreciated. Another way to donate (with a lovely win/win experience) is to participate in Facebook auctions for galgos. Just "google" exactly that – "Facebook auctions for galgos" – and you will find a lot of them with many beautiful items to fall in love with.
A wonderful and very selfless way to donate is by telling your friends and family that, instead of a gift for your birthday, Christmas, Valentine's Day, or any other occasion, you would like them to donate in your honor to your chosen galgo rescue organization or adoption group.
You can also donate to Facebook fundraisers organized by galgo rescue shelters or adoption groups. You can "google" those fundraisers as well.