<human>: Could you distill the essence of the text into 1-3 sentences?

I say "someone" because of what the vet told me.

I put my dog out to play today for 30 minutes.  Basically a pee & poop break.  We had already done our daily walk.  I am inside, working on the computer.  I don't hear anything from her.  Today was also medicine day, her monthly pill.  I prepared her food and meds and went to get her. 

She is limping towards me with something dripping off of her leg.  It's blood....and I mean a lot of blood.  She was covered up to her first joint in blood.  I went into "medic mode" got some compression bandages, gauze and towels and went to work.  I couldn't stop the bleeding....it was gushing all over me.  I frantically called the vet and rushed her to the doc.  She was lethargic and almost non-responsive by the time we got there.  She was immediately prepped for surgery and given an IV.  

According to the vet, post surgery...4 veins in her leg were severed.   Not cut...but severed.  The cut was deep and smooth.  My vet and another vet who helped operated on her, concluded that only something made out of razor sharp metal could have done that kind of damage.  This occurred at 5pm.....I just got in from combing through the yard with 5 people looking for anything that could explain it.   WE FOUND NOTHING.

I'm not sure if it was a freak accident or someone actually did try to harm my dog.  As of now, she may or may not loose her limb, and almost died due to blood loos.  I'm numb from the emotions.....I really don't know what to feel.
<bot>: Someone may have attacked my dog and tried to kill her Or razor wire appeared out of nowhere and severely cut my dog.