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Answer`s (2):
1. sammi_stephens
I would check with the Arizona Humane Society. I am sure they can recommend reuptable vets.

Most vets will take payments but, you might need to go through a credit check and be approved.
2. peanuttpuff
there are many animal hospitals that accept payments!! who wouldn't accept a payment? how else would they get paid?
Doctors in Phoenix, AZ