Ok, you'll need to find spawn which has skills as close to your pet's skills as you can. I usually lore a pet and train up the lowest skills first so they're all around the same level. Then it's a case of fighting progressively tougher spawns until you're done. Oh and chose magic casting critters when you can, then you'll also get some resist gains.
This guide is old, but clearly set out explaining how to train pets and it won't include as many Tram only creatures. So it's probably the most "red friendly" guide
You'd just need to look at the
Hunter's Guide for the revamped dungeon spawns.
Wenchy