I agree with supporting local rescues and shelters -- but remember, dear friend, that local shelters also need to pay the electric bill, they need to buy stamps and paper and copier toner, and they need to pay someone to do their accounting and bookkeeping. Those are all administrative expenses.
Don't begrudge a nonprofit its administrative costs, as long as those administrative costs are in line with its overall budget. Usually 20 percent or less is considered acceptable. Most nonprofits have posted their tax returns and audits online, or on a site such as GuideStar. The forms will specify the percentage of budget spent on administrative costs. Or you can call and ask.
Thanks for supporting animal rescues!