How scary and awful. I agree with using a martingale or limited slip collar. Squash just backed out of his harness a week or so ago when I was biking with him, the effer.
Yes, this. We use a martingale for walking Biscuit (or sometimes a harness), but Biscuit always has a flat collar on with tags as well. That way, if she slips away somehow, at least she has tags (and microchip).It's also not a bad idea to put a regular rolled leather or flat collar with id tags on them, that isn't attached to the leash. If they should slip a collar, people can see that the dog has id tags from a distance and will usually try to pick them up and call the owner. Without tags, they may think they were dumped, and will not have an owner or be hard to catch. Do microchip as well.
I do the same in the car and at this point Jubel is used to me opening the back door, reaching forward to hit the front door button to lock the doors, close the front door, then un-clip him so he waits nicely. It's now habit for me to take my time in this process. Took my foster Duncan to the pet store a few days ago to get his nails trimmed and the social experience of walking around the store a bit. This was his first car trip in a harness and clipped in. He did fine when we arrived at the store and waited for me to un-clip him. When we got home after I opened the back door and moved to hit the button to lock the doors Duncan made a jump for it out of the car. The tether caught him before he could reach the ground. Poor thing had no clue what was going on and just whimpered and cried until I lifted him back into the back seat and released him.I also buckle them into the car using a tie-out safe harness and a carabiner (weight bearing for human climbing activities) - aside from the obvious safety help while driving, it means that I can open the car door without fear of them leaping out and darting away.
Yes that's why I decided to double collar training dogs (prong/marti) as there is nothing worse than walking from kennel to training bldg and when you look down, there you are alone at the training bldg door with a dog rolling around in the grass behind you just laughing his/her butt off. It does make one feel a tad silly.I have also had a prong collar pop open, the dog just ran over to play with another dog and she still had her martingale collar with tags on it.