Does a law enforcement officer violate the Fourth Amendment when he unnecessarily prolongs a traffic stop to conduct a drug dog sniff after completing the traffic-related tasks?

1.Does a law enforcement officer violate the Fourth Amendment to the Constitution when he has every thing he needs to complete a traffic stop and finish writing a warning ticket but delays the end of the stop and chooses to have a drug dog sniff for drugs instead of finishing? Parties 1.Petitioner,Martin Devalois 2. Respondent, United States of America. No related cases 2