Er, also I keep hearing that harnesses slip that's why I'm asking :3 I want a good one.

Collars are for walking, harnesses are for working. We use a limited slip White Pine collar on our dogs for outings, with the limited slip there is no getting out of the collar if properly sized. We also work our dogs in harness so when they are in harness I want them to want to pull, obviously that is not something I want from them when we are trying to walk on lead. So different sensations for the different purposes.

I agree ^ We do the same thing here. My dogs know not to pull if they're on their easy walk harnesses or their flat collars <- do they forget sometimes? Of course! They're dogs! But for the most part they're fantastic. When I want them to pull for rollerblading, sledding, skijoring, etc. they are either in their x-back harnesses or their harnesses that have a clip in back (similar to putting the easy walk on with the clip on the back instead of in front.) It takes some time, patience, and training- but they will get it As for the collars- as someone mentioned, if they're fitted properly the dog shouldn't be able to slip out of them- if you're really worried about it the martingale is a good choice.