The Miami-Dade Police Department received a tip that the residence of Joelis Jardines was being used to grow marijuana. A drug-sniffing dog was taken to the door of the home. The dog signaled the presence of marijuana, a search warrant was obtained, and a search discovered marijuana growing in the house. Jardines was arrested. 

Question 

Did the use of the drug-sniffing dog render the search unconstitutional? Explain.