Was Nina "too damaged" or "not right to begin with?" We really don't know. Is Nina still adoptable? Sadly, we may never know. Of course, Ms. Huberty felt guilt and sadness when Nina was sent packing, and recognizes that Nina has little chance for being adopted again.
Playing "musical dogs" can indeed be perilous Living with a dog is a two-way street and assigning unilateral blame gets us nowhere, and once again leaves the dog out in the cold. Playing "musical dogs" can be very bad for the dogs, as much research and common sense tell us. I wish Nina the best of luck as she might be facing an uphill battle to find a suitable and permanent home in the future.
So, yes, perhaps Nina was "the wrong dog" for this particular family who generously tried to give her a new home. But, it's also possible she was trying as hard as she could to fit into their physical and social milieu, and was begging of them in the only ways she could, "Please give me more time, I'm really trying as hard as I can." Or, perhaps, Nina recognized there was a misfit and was feeling something like, "Oops, this is the wrong family for me" and wanted out. Ms. Huberty's essay raises many questions that demand serious attention. I hope it is widely read.