This is the video from the homeless dog that get in my car and get agressive!

So today I was in the field for joking (Here is the video from the dog in the car https://www.youtube.com/watch?v=cK3aMpuYSw4) and this dog start to follow me and run behind me. I see this dog for first time so I think that maybe he have escape from someone and immediately I post a video of him on facebook maybe someone knows. The night someone send me message for more infos and told me that maybe this is his dog that he lost before 8months. I told him that I will go to the field to see if the dog still be there and if he is there, I will call him to come and check If it's his lost dog. When I arrive to the field I call him and immediately he run on me and start hug me and play with me. I call the man and he told me to wait for him to arrive. While I waiting for him to come, I had my door from my car open and I was out to smoke so the dog get in my car and sit on the seat and I left him. When the man arrive and see the dog told me that this isn't his dog and he leave. I call the dog to get out from my car but then he start to be aggressive and attack me. I couldn't even get in my car! I try to pet him and he don't let me. He understand that I will leave and I will left him alone! I was for an hour about out of my car and I was trying to calm him so he can get out but he was so aggressive! Finally I run back to my home and I take dog food to give him. When I give him food he get out. I could take him on my home but I have already three dogs and I haven't space for him so I post again a video of him on social media and I call the animal shelter and some one is interesting to take him and finally he have a home now! The new owner arrive the midnight and take him!