Lost & found small mammals in Maine

Cream guinea pig with brown patches and blue harness

I found a small cream guinea pig with brown patches wandering near the Portland Head Light in Cape Elizabeth this afternoon around 3:45pm. It's the size of a standard guinea pig, with soft fur and a bright blue harness that has a tiny silver star charm. One distinguishing feature is a small white crescent patch on its left shoulder and a barely-visible scar behind its right front leg from a past scrape. It seemed a bit hungry and nervous, so I kept it safe in a tote in my car while I tried to figure out where it came from.