I would suggest training low-level pets in trollsblight caverns. You get a ton of chests there, and none are booby-trapped. I made 20,000 gold there over three days.

torll caverns, fairy grove, and nightfall bandit camp are all good-plus you can lvl up a bit for some pets ;) and if your pets are really good, you could sell them. or try selling things from scale shop like pet dye or mutators-scales come from nurturing so yeah. its nice, but might take awhile.