58-year-old Rakesh was feeding his dog Tyson outside his house last evening when four to five men attacked him with knives, they said.
Tyson pounced on them, injuring them brutally. The group also attacked the dog with knives. But Tyson kept fighting them and the gang fled the spot, police said.
Meanwhile, Mr Rakesh's family members were alerted by the commotion and came outside the house.
Both the man and his dog were given medical attention, they said.
The police added that the culprits have been identified and efforts are on to trace them.