Re: safe collars/harnesses
The problem is not with the flat collars, in general. Most flat and even training collars are fit on the dog way too loose. If a collar is fit tight enough (one finger under, max two), they are reasonably safe.
I bought numerous harnesses for my dogs and don't like anything on the dog back that blocks air movement, as dog will over heat come summer time.
I also think that with a harness, the dog must know heel off leash (with distractions), otherwise, the owner will get a gym quality workout every time.
If you want the best seat in the house ... move the dog