Um...no. Though, I will admit he was a turd today.
He's been the subject of several dogs wanting to go after him lately, but I didn't understand why. I put myself between a couple of dogs, mainly my neighbor's dog (not on a leash) because their dog became aggressive. This afternoon my dog had enough and tried to take it out on another dog, so I immediately purchased a prong collar for him.
However, I know it was best thing for him. He was the perfect doggie all the way home. I left it slack, and kept the gentle leader on him and focused on that.
I think he was just tired of being the one singled out or picked on by other dogs. Regardless, I won't put up with it. I did what I had to, but keep it slack and if he does lunge or anything, he does it to himself. To be truthful, I think he figured out it was male dogs who weren't fixed that singled him out, and the dog he singled out today wasn't fixed. (He, by the way, is)
I love him dearly, and no, he normally isn't aggressive at all. However, I know enough to know (even if I am new to dogs), that if a dog shows any signs of it, it must be addressed right away. So, there's my day in a nut shell!
I still love my doggie though...and nope, ain't willing to give 'em up.