Ok, so summer is officially here! Well, I call it summer when it reaches 90 degrees in FL regardless of the date

Today I went to Walmart and I was leaving and something caught my eye.
There was something moving in a small red truck cab. The inside of the cab was all black but I know I saw something move.
I walk a lil closer and it is a dog!!

This looked like a chihuahua but it was so tiny. it was the size of a half liter water bottle with lil legs. His head was about the size of a golf ball!! His tongue was hanging out and he was running back and forth on the dash board in the sweltering heat!!!
I left a note the car informing them it was against FL law to leave a dog alone in a car regardless of the temperature!!! I was not thinking and was gonna leave but then realized what if they dont come out soon????

I was about to call the police but I waited only like 4 min. A man and a lil boy walked to the truck and got in. The lil boy took the note. I am not sure if either of them could speak or read English. I am hoping the lil boy is in school here and could tell his dad what it said.
My husband warns me all the time to stop being so confrontational because when I see something wrong I take action. Usually I end up face to face in heated discussions!! I am wishing now i had just waited by his car
Why are people so stupid??? I know that is not nice but I have to find a way to educate people how dangerous this is.
hmmmm maybe a bumber sticker???
I keep saying I am going to make a biz type card already printed up
that i can just leave on the windshield.
Any other suggestions?