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I've been looking at a local rescue since before I lost Sally back in February. There are dogs that have been on since then, and others certainly since mid summer. Both local rescues seem to find homes super quickly for small/medium dogs. The big ones get overlooked which is sad. Of course, they are all the products of poor training, no time, no understanding of what's needed.
At least cats are usually given up due to their owners going into care, or their housing situation has changed...sad as it is. Or, they are strays/feral.