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.
The more of it there is, the less you see.
A tree with 5 branches, no leaves and no fruits
A muttered rumble was heard from the pen, and I, in my walking stopped to look in. What was this I saw? A massive beast, hoofed, and jawed. With spikes upon its mighty brow, I watched as he struck the turf and prowled. And yet for all of his magnificence, he couldn't get out of that wooden fence.
What is yellow, looks like the moon and has seeds?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?