# dogs have surrounded me

"my enemies are like dogs that have surrounded me" 

# a company of evildoers

"a group of evildoers" or "a gang of evildoers"

# encircled

stood in a circle

# they have pierced my hands and my feet

This continues the dog metaphor. The writer speaks about his enemies as if they were dogs that are biting and piercing his hands and feet with their teeth. 

# pierced

stabbed through something with a sharp object