PHILADELPHIA — The frustration jumped off the Instagram page: "I have never ever seen this many people trying to dump their dogs," posted Jessica Mellen-Graaf of the Philly Bully Team dog rescue. Already swamped, her rescue team had received 20 requests in 48 hours from owners who wanted to give up their dogs. "We knew this could happen," she said. "I just don't think we thought it was going to be this bad." In the early months of COVID-19, the near-emptying of the nation's animal shelters was one of the few bright spots in a dark time. ASPCA data suggest over 23 million American households ac...