If you work with an animal rescue, you know that every bit counts. I'm frequently asked to donate my work and I do love to help.
Here's two ways I now help bona fide non-profit rescues and other worthy organizations:
Your rescue can run a Portraits Sale for a 3 week or month long period. I will donate 25% of every portrait your rescue obtains; or
If you are signed up as a charity on EBAY, I'll paint a large, original piece for sale and then designate your rescue as my charity and donate 25% of the sale of that piece to your charity. Of course, the more bids your rescue can generate, the more your rescue will receive. And the lucky winner may, or may not, be someone from your rescue!
I just restarted my ebay art store, search for rzzart to see what's up for bid, large or small.