Could very well be...the dog walker/runner said the dog was barking at something in the weeds and excited before it died. That led me to think possibly a poisonous snake bite. There was a recent biting in the womens' room at that same place by a copperhead.

Did the copperhead survive?

 LOL! I don't think it was the snake that was bitten!
 
It got away. It was in the "loo" as you call it. 

Ok,  I'll try again...
 
A woman with a missing leg.
A dead Rottweiler.
 
 
 
 
 
I'm guessing it was poisoned...

I got it, Karyn.  You're suggesting the woman's leg was poisoned, thereby killing the dog when he ate it, right ? 
 
 

I can always rely on you uB

Keep trying Karyn.  These guys are just sloooooooooow.
 
(But I loved it!  )

I think I've got it. 
 
You take the chicken across first, leaving the rottweiler and grain together on the other side.

You return and get the rottweiler, but when you deposit him on the other side, you take the chicken back across, so that the rottweiler and chicken aren't left alone together.

You drop the chicken off back on the other side, pick up the grain, and take it across to deposit with the rottweiler.

Finally, you return to retrieve the chicken and take it to the other side.

Yeah... errr..  something like that.
 
But if you just left them alone, the chicken would eat the grain, the rottweiler would get fat on the chicken and wonder into the road where it gets run over.
 
So you got rid of all of them without ever having to cross the road yourself..

Why did the chicken cross the road?
 
'Cause the rottweiler did.