[Help] I saw a german shepherd kill a chihuahua at the dog park last week. Need advice moving forward.

I carry a big knife when I walk my little dog who is half malteese half jack russel and she is terrified of dogs and people so I wasnt too thrilled when a pitbull ran up to us off a leash and he was sniffing the shit out of my dog like sight hounds do and it just did not sit well with me so I put my hand on my knife right in front of its owner who was doing nothing to control their dog and I put myself inbetween the pitbull and my dog and blocked it from getting to my dog and it was done in a way that my face got close to the pitbulls face but I was just happy it was focused on me and thankfully it seemed realized what I was doing and backed off a little as I made sure to be kind of aggressive all the while with my hand on my knife half hoping this clearly aggressive dog would take a bite at me so I could shove my knife in its throat and I made sure its owners knew that. They werent too happy but Im not the one letting an 80 pound killing machine run around off its leash in an open park.

/r/dogs Thread Parent