Brother unable to save sibling from fire in Mebourne

A man who tried to save his brother from a deadly Melbourne house fire was later arrested after an incident with a neighbour.

Warren Zuijdwijk, 52, died after he and his pet dog became trapped in the blaze at a Mordialloc unit early on Sunday morning.

His brother and housemate, Dean Zuijdwijk, said he tried to go back inside to save Warren, trying to break down the door.

"I tried to get back in there and the heat just blew me back out the door," he told reporters.

"That's when I knew he was gone."

Mr Zuijdwijk, 49, was later arrested after allegedly clashing with a 35-year-old neighbour.

Both men were taken to hospital with minor injuries.

Investigations into the cause of the fire continue.