Poor Frankie

So Friday I left around 8:45 am to go to my Stroller Strides class like I normally do. I had no idea that Frankie had snuck out while I was loading the boys in the car. I went to my class. Around 11 Mark calls me and says "How long till you will be home?" and I say "Um, in a few, why?" and he says "Frankie has been attacked by something, the pool guy just called me. He is bleeding and won't come to him." OMG I guess Frankie had somehow gotten away! Mark rushed home and so did I. I bawled the entire way home. It was all my fault that Frankie got out! I got home to see Mark holding Frankie in a towel covered in blood. I wanted to see him just in case he didn't make it. Mark rushed him to the vet. After what seemed like an eternity Mark finally called me to tell me that he was in surgery and they were checking to make sure that he would be able to eat and drink normally, if not then it would probably be best to put him down. I started bawling again. Finally about 2 hours later Mark called me again to tell me that he did good in the surgery and he "should" be fine. We just need to make sure that he eats and drinks normally for the next week. My poor little Frankie. Here are some pictures of his wounds.

Stitches along the top of his neck.

2 puncture wounds under his neck

Then this morning on my way to Stroller Strides, at 9 am I see this running down the street! So scary. We called animal control and they are going to come out and investigate! What is going on? We have never had this problem before.