Normal Shedding or Medical Problem

[NaNa8]

Laci is 9 mths old and I am not sure if what is happening is normal or not. At first I believed that she was shedding. It appears that her hair is falling out on her back only. I can rub my hand on the top of her back and lightly close my hand into a fist and end up with a fistful of hair.

She was spayed on the 16th and I am not sure if this is due to this or is there an underlying problem. I do have an appt on Monday to get her stitches taken out and I do plan to ask that question, but thought I would ask if anyone else has had that problem.

Thanks