My 10 year old lab mix has a history of allergies. For the last 2 years we have had it under control with either no or minimal hair loss. I noticed a few days ago that she was shedding more than normal and since then she has startd getting bare around the neck. She does not seem to scratch more than normal. We have a vet visit planned but we live in a small town with only one vet and it will be next week before they can fit her in. Any ideas what issues could cause this. She is an indoor dog, eats blue buffalo with small amounts of raw meat added and has done well till now. Also we had to put down our other dog thursday of last week. Can stress cause this type of hair loss?