Gonna have to rehome my baby 😭💔

I recently lost my second job and am having a hard time finding another. So I only have an $8.00 and hour part time job that I get only 25 hours or less for 2 weeks. I have a dog and a previous bill at the vets that I am paying off. I need to get her in again because she has some odd bumps that keep showing up 1 at a time. She has like 4 of them. They don’t get any bigger, they stay the same size. She doesn’t scratch at them and they don’t hurt her. She also seems to be losing hair. Not a lot, just a little, but a noticeable amount. She doesn’t scratch or anything so she doesn’t have mange or allergies. That’s what my vet told me over the phone. It’s $45 just to have her be seen, and then I would have the tests she would have to have. I just can’t afford it. I feel like such a shitty pet mom. I asked them if I could get her an appointment and make payments on that bill as well and they won’t let me. They said I have to pay the whole bill the day she is seen. Which I understand. I just feel like maybe I should start looking for a new home for her to go to that can properly care for her. I was training her to be my service dog and everything, but now if I can’t find another job soon she will need a home that can provide for her. I really hate myself. I am heartbroken 💔 I love her so much.