A couple were forced to watch armed intruders attack their pet dog as their young child slept upstairs.
Two men armed with knives burst into a home on Homestead in Clayton Brook, near Chorley, at around 10pm on Monday, police said.
The victims, a couple in their 40s, told detectives they were threatened by the two men, who demanded money.
Although the man and woman were not hurt, the men became violent when they then turned their attention to their pet Staffordshire Bull terrier.
The animal suffered a “slice” type injury to the head after being hit with a weapon.
The intruders escaped with mobile phones and the keys to the family’s saloon car, which they stole to make their getaway.
A short time later police patrols spotted the stolen car being driven in the Croston area, leading to a police pursuit.
Two men were arrested at the scene.
Det Sgt Ian Darbyshire, of South CID, said: “At the moment we are still investigating the motive, but we believe it to be a random attack.
“It is being treated as an aggravated burglary.”
* Two men have been charged in connection with the alleged incident.
Joseph Devaney, 21, of no fixed abode, and Kieron Rolston, 22, of no fixed abode are charged with aggravated burglary.
They appeared before Chorley Magistrates Court on Wednesday and will next appear before Preston crown Court on October 3.