My mother and I are experiencing the exact same problem with our standard poodle Emerald whom we adopted from Pasadena Humane Society two weeks after our French poodle Sticker was run over. Due to the fact that she belonged to a homeless man who ended up in the hospital for only god knows why she ended up at the shelter and when we adopted her nine months ago she used to bite our fingers when we tried to clean her butt with baby wipes but we persisted on doing so and now she is used to it. What you can do is give her a treat or something that you know she likes so that you can earn her love and her trust. Or perhaps you can take her to the veterinarian so that he can prescribe something that will calm her such as ritalin. Sometimes she stil bites us for no apparent reason but we spray cold water on her face with a spray bottle and she leaves us alone. This behavior won't last forever she will eventually get used to your ministrations and lick your fingers just as our Emerald is doing.
You need to earn her trust first. Let her be, and let her come to you., she’s probably not use to having NICE human contact, Poor thing
They have classes, they should be able to help
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