A lot of the cats that get posted to the WHCP Facebook are claimed that day. Not always, but its definitely a possibility. I suggest going on Thursday, asking if he is available, and even if he isn't, look who is. Thats how we got our boy Rudy :)
Agreed - best thing to do is fill out their adoption forms and get on the list of those wanting to adopt. It took us about a month to get to the front of the line, and we just got a wonderful male tabby kitten from WHCP a few weeks ago. Might take less time for an adult cat.
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