It's not made by Yahoo, it's "powered by Yahoo". It means that they use the Yahoo! API to run their search engine. So any results you get from there would be the same results you would get from Yahoo.com

If they give part of the advertising money to charitys, that would be great but just like researching a respectable breeder, you should look up the owner of the site and if they are actually donating to said charities. Just make sure it's all legit and that someone isn't taking advantage of your good will.

Rick