Only way to know for sure is to take your dog to a vet. It could be mange, thyroid issues, allergies to mold spores, fleas, or pollen, or several other things. The vet can help you figure out and if you don’t get to the bottom of it she will only get worse over time!
In the mean time you need to get all grains out of this dog’s diet, that includes treats (no sharing corn chips or bread from your sandwich any more!). Find a real pet store (that does not sell puppies) and ask to be directed to the grain-free selection of dog foods. Then start reading labels. You want a product that lists real meat as the first 2 or 3 ingredients, and has no grains. Real meat will be things like lamb, beef, elk, pork, salmon meal, whitefish meal (meal is the entire animal ground up and dried, a good thing). Do not buy any food that lists ‘by-products’ in the ingredients since poultry by-products can be nothing more than chicken feathers!
Next you can help calm the itch and heal the skin with a vinegar and water rinse (1/3 vinegar, 2/3 water). Soak the dog with the mix and allow it to dry in her coat. You might also want to try Witch Hazel with Aloe Vera — find that OTC at any drug store. Pat that on the really raw places a few times each day and allow it to dry.
Vomiting can be caused by her chewing off her hair and swallowing it, or it could be an indication of her underlying condition that is involving her skin. You need to get her to a vet and get her the relief she deserves.
That is horrible! I can’t imagine how that must feel. My heart is breaking for you just reading your question. Two points I think you should consider. This may help you or hinder you, depending on your answers…but may help you with your direction.
1. Was Maya their patient at the time of the escape?
2. Did you bring Maya in with you to have the puppies examined or “picked up”? (I am not sure what this means).
The point I would think you should consider is that if Maya was their patient and it was during a visit, which was still active as Maya wasn’t officially handed off to you, then you totally should approach it as the Vet having responsibility.
If you brought Maya in with you for the purpose of something else….I’m sorry to say…that I don’t believe they are anymore responsible then the mailman that walked in the door. I do hope this helps and I’m sure they’re were many more factors then what you shared…I hope this helps you a little.
Sorry for your loss – at the very least you should have a conversation with your vet to find out what steps will be take that this happens to no other dog in the future (installing a gated area at that back door for example).