Please note that they only count 1 click per day. From their FAQs page:

How often can I click on the "Click Here to Give - it's FREE" button? Can I just keep clicking and give thousands of bowls of food at once?

You can click once a day, every day of the year on The Animal Rescue Site. Our agreement with our sponsors allows us to count one click, per person, per calendar day. A monitoring system is set up to check this. While you could click on the button ten or a hundred or a thousand times, we will only count one click from you. In the meantime, our system could be slowed down, possibly overloaded, preventing other visitors' clicks from generating funding. Please note that we count clicks received through company firewalls, proxy servers, etc., to the best of our ability. We count every click as fairly and accurately as possible.