Our lab used to shed like crazy if anything stressed her. You'd think it she was like a porcipine throwing out quills.
I have noticed that Jayden (who has no reason to be stressed by anything) is currently shedding. But in his case I think it is because the weather has been so weird. I think he started putting on a winter coat when we had an unusually cold spell in November. Now it is unusually warm….I think his body thinks that Spring has sprung and it is shedding some of his winter coat.