No walkins and there are no public hours. Only when there are events and fundraisers. It is because it is a very demanding job. People have good intentions and only try to help but unless one is experienced in the ways it does not go well with the animals or people. The owners would need to supervise visit and take responsibility.
Definitely not any time. Follow their Facebook page and sign up for an upcoming event. And donate when you can because running a sanctuary requires a lot of physical and emotional work and they always need funds to keep the animals safe and healthy.
I can't say for sure, but I would expect that they might be happy to welcome volunteers almost any time with advanced notice
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