Most PB isn't *insanely* high in fat. Though it's not "low" either. But I probably wouldn't stress about a little PB for most healthy dogs.
Although if you were worried about it they do have those peanut butter powders that you can make. This one is low in fat for example:
https://www.iherb.com/pr/PB2-Foods-T...E&gclsrc=aw.ds