That I didn’t know. Our local sheriffs dept only has 1 dog, I think. They routinely detain people until the k-9 unit arrives.
Under Indiana law, absent probable cause, the police can detain you during a traffic stop for no longer than it takes to write the ticket and dispose of the infraction.
They can detain people upon a finding of probable cause. They are using the dog to obtain the probable cause, and the SCOTUS just said no.
Then they are breaking the law.