On Sunday, 19-year-old Karan Arora was arrested in connection with the case and this week, three more people were nabbed.
The police also seized the knife which was used in the crime.
The incident, in which the deceased's elder brother was also injured, took place on the intervening night of Friday and Saturday.
The three accused persons were absconding since then, the officer said, adding that raids were conducted at various places of their hideouts.
Arora is currently on two-day police remand, he said.
Based on a statement of the wife of the deceased Vijender Rana, a case was registered at the Uttam Nagar police station, he said.
Ankit had taken his dog out on a walk when Rana's tempo brushed past the canine following which it sustained minor injury.
Enraged over this, Ankit picked up a fight with him. His brother Paras and the other accused also joined in and they allegedly attacked Rana with a knife.
When Rana's brother Rajesh intervened in the matter, the accused persons also attacked him with the knife, they added.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)