I'm going to pull my dog along by his collar
Did the dog do something you disapprove off?
No, but my ex-boyfriend got mad with me because I did that to my dog when we were in a relationship
You're ex-boyfriend was right to be upset when you were so rough with your dog. Pulling him by the collar is hard on his airway, and is no way to treat a pet. You could injure the dog by doing this, and you might make him afraid of you.
Awe don't be so sensitive about it.
I am not being sensitive. It's just common sense. How would you feel when someone pulls you by your necklace?