Pixie's Fur Loss

My first indication that something was wrong with Pixie was his fur loss. He had a huge patch of
nothing under his neck. Then when the lethargy set in I took him in and got the diabetes diagnosis.
Now Pix is a long haired chubby who never, ever grooms himself. We would shave him down every summer
to help with the fur getting all matted up.
So now I wake up and come home to little tuffs of fur scattered throughout the house...almost looks like he was
in a scuffle.
He now has bald patches on his back and top of his hind end.
All other bloodwork checked out with him at the vets.

Is this going to resolve itself when he is regulated?
Is there anything I can be doing for him?

I don't really see him grooming or licking it out....

 

This may or may not be related to diabetes.

Does his skin seem to be bruising or tearing easily? If so, then investigating a diagnosis of Cushings may be warranted.

Allergies: It is possible to do blood testing for allergies.
Also, since you've been doing food changes, look back at what was being fed before the fur loss began and make a list. Now look at what you have been feeding and make a list. Items appearing on both lists are less likely to be a problem. Items appearing on the new food list are candidates for allergens.