There was something called a "drug sniffing dog," road block in Florida this week. The highway I was driving had a lighted sign announcing it, two miles ahead.
When I came up to the LEO's they politely but firmly demanded I allow their dog access to my car for a sniff. I politely declined, saying, "You Do NOT Have My Permission To Do Any Type of Search."
The LEO actually stated I did not have the "right" to refuse and I countered that my family attorney is a retired superior court judge, on speed dial, and he says I do, so the answer remains, I Do NOT Consent To Any Search.
They whined and tried to intimidate me for about ten minutes, I continually, like a broken record, offered to have my attorney come to the road block and speak to them about the fourth amendment, and they eventually gave up, when someone made a speedy u-turn and drove away.
I've wondered ever since what would have transpired if they hadn't found another potential playmate.