Answer:
Well when dogs join something like the police force they are trained to sniff out bombs, drugs, people and etc. Which is very helpful because they can detect things that we can't necessarily detect all the time. Which makes them a quicker method of detecting things.
Your answer would be number 2 :)
The alliteration makes the poem lighter and freer than it was before.
I believe it is the second answer, "why did you interfere? your arm allowed him to stab me". Hope i helped !
