Answer:
I'm not man's best friend, I'm their enemy, I can mark your end, yet you do not see me, I am very small, but very tough, If you have me, then you have it rough.
If you spot one of these eastern warriors, they're not doing their job right.
In your fire you hear me scream, creaking and whining, yet I am dead before you lay me in your hearth.
What kind of pet always stays on the floor?
It holds no blessings in disguise. Its rhymes are aimed at your demise, it's cast only to ruin, Whatever you are doin'.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?