Thunder Coat for a Dog (Pelham NH, off Mammoth Rd)

Odd request but thought I should try...
My dog has anxiety which has worsened in her later years (she's now 14.5). I'd like to try a "thunder coat" which I guess is like a weighted blanket that hoomans sometimes use :) Would be willing to borrow for a short time to see if it helps.
Appreciate you considering this request!