I am pretty sure they aren't open on Sundays, but I could be wrong! And declawing a cat is inhumane, so most vets won't declaw anymore. Just like if you were to declaw a dog, it's very painful, and should only ever be a last resort. You should try calling them during hours and asking, they might have you do a meet and greet :) I wish you the best of luck finding your furry friend!
declawing is like removing the top nub of your finger you uncultured swine.
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