Not necessarily. For example, if the police pull over a passenger and the passenger refuses to consent to a search, the police in some jurisdictions will try to slow things down and call for a dog to sniff around the car. If the dog “alerts”, then that search the cop wants the cop may get, consent or not.

The nuance with the dogs is that it’s sort of akin to the police seeing something in the open with unaided eyes. Except it’s the dogs using their unaided senses to sense something “in the open” air.