Type of collar = strangulation risk ?

When I leave the kitchen door open to the garden, I put a collar on my girls with an ID tag, should they ever escape (I work on the principle that they have them so they’ll never need them). The collars are brightly coloured with big reflective strips.
I was watching them staffy play together and realised that they do grab each other’s collar. This loosened the collar but it could also have tightened the slip-to-set-size collar.

I have now replaced them with collars that are adjusted by a long velcro strap. Safer.

I would never leave collars on fogs when they're not fully supervised. 

The thing is, if your dog has a good recall the chances of them escaping & getting list are negligible - providing they are supervised. 

I've seen a couple of horrific instances (and heard of others) of unsupervised dogs with collars, one of which ended in death. 

I never leave collar on Vin either but tbf he cannot in anyway escape the back garden but even if he could I would be scared that if I wasnt looking now and again said collar could get caught on fencing or such like. Velcro seems a better idea though

Well, I normally wouldn’t leave collar on but I can’t sit and watch them the whole time I’m home and they are loose.
If they wanted to, there's always an escape route from the property.

They also have an anti-flea/tick collar during the summer/autumn as they’re a problem here in the countryside.

Damned if you do, damned if you don’t