They contacted you, "We have your dog!"
You said, "I don't want her" and held to that, even after they told you the chances of her being adopted, given her advanced age and poor condition, are slim and zero.
"Can't take her," you said. That whole new job thing and leasing an apartment that doesn't allow pets and - oh, that girlfriend, who was supposed to be taking care of your pup in your absence, has now joined you, and she doesn't like dogs. Well, that all makes perfect sense. Perfect.
Now, in case this isn't already clear, I find your actions incomprehensible - not a little bit - a lot. "Incomprehensible" is the nicest word I could hit upon and really, it's too nice of a word for this. I can hold to the boundaries of that word though, because of the great and wonderful acts of mercy that your act spawned, acts that crack me open with gratitude.
It starts with Shannon from the Animal Services, who knew your dog would not live the week without a miracle. So she started one. She found the wheaten rescue group here in our State and sent them a most earnest and heartfelt plea. I have a copy of it and I will keep it forever, with gratitude for her kindness. Then there are Melissa and Sue, part of that rescue, who put the notice out about your sweet pup, your difficult placement: "She needs a forever home immediately, someone who will take her sight unseen." They committed to support with adoption fees and vet bills for the person who might step up.