There are lots of good reasons to avoid leaving your dog in your car, but there are lots of good reasons why it happens. In SAR, we get our dogs used to being in the car because we might be given a task that doesn’t require the use of a dog. For example, helping to carry an injured subject out of the woods is an all-hands drill, but you don’t want a dog running around underfoot.
So if your dog is going to be in the car for an extended period, it’ll need potty breaks. Will you be around to do that?
Some dogs consider a car their “territory” and will defend it even if they’d welcome burglars into the family home. If yours is one of those dogs you should desensitize it to having strangers get it in and out of the car.
Start out by having a friend with whom the dog is familiar get it in and out, with you present. Have them (not you!) provide lots of treats as they go. Then move up to a stranger, but again with you present. Finally, have a stranger go up to the car with you nearby but out of sight.
If your dog just won’t accept a potty break from a stranger, that’s OK. At least you know. And if it will, all the better. It’ll put your mind at ease in situations where you might have some bigger issue going on.
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