Callous robbers stabbed an 11-month-old puppy in the eyes during a broad daylight robbery in Sydney’s Hills District.

Juice, a Staffordshire terrier, suffered extensive injuries and is now facing an urgent operation to save his left eye.

His 20-year-old owner discovered the badly injured dog – bleeding from several facial wounds and shaking with fear – on Sunday afternoon at their Bridgeview Circuit home.

A laptop and some personal documents were stolen from the house.

Detectives believe the same offenders could be responsible for a string of nearby robberies, including one which saw a teen threatened with a screwdriver.

At about 3.10pm a home on Chepstow Drive, Castle Hill was broken into. The two bandits confronted a 16-year-old boy and threatened him with a screwdriver.

Juice suffered extensive injuries during the attack. (9NEWS)

The thieves made off with a laptop and some cash before fleeing the scene in a white Mercedes AMG sedan.

Police are hunting two men in connection with the string of crimes. (9NEWS)

Detectives from The Hills Local Area Command believe a similar car was seen at the scene of the previous robbery and may also be linked to a later bag snatch.

A 53-year-old woman told police two men got out of a white Mercedes and stole her purse after a scuffle.

One of the offenders is described as being aged in his late teens or early 20s, Caucasian in appearance with a thin build and short, blonde hair.

At the time of the incidents, he was wearing a loose-fitting white shirt and blue tracksuit pants.

Police believe the robbers may be involved in a string of other crimes. (9NEWS)

The second man is of a similar age of Middle Eastern or Mediterranean appearance and was wearing black tracksuit pants and had a black and red bandana over his face.

A third man may also be involved.