Looking to me like a Yorkshire Terrier dressed for Halloween, this is actually a Milkweed Tussock Moth caterpillar (Euchaetes egle), out and about in late summer and now, early autumn. These larvae principally choose Milkweed (Asclepias) or Dogbane (Apocynum) as their host plants. Not to be of concern though. These caterpillars generally go for older…