Officials said the incident occurred in the noon when a CISF officer noticed a brown coloured dog, owned by a retired naval officer, roaming in the cargo apron area of the Indira Gandhi International Airport (IGIA).
The officer immediately alerted the sentries and other airport security staff deployed on the tarmac side to locate the canine, they said.
A team of CISF personnel, airlines staff and animal catchers are looking for the dog on the airside of the airport but it is untraceable till now, they added.
The owner of the dog has been given a special pass of the Bureau of Civil Aviation Security (BCAS) and he is accompanying the security personnel in tracing the dog on the airside, including the cargo area.
"It is an important task to find the dog as it can be a threat to the aircraft landing and taking off from the airport," a senior airport security officer said.