Some blind individuals use guide dogs.
Guide dogs are very highly trained and disciplined.
Most of the time the dog will lie quietly under or beside the table or desk. The greatest disruption a professor or employer can expect may be an occasional yawn or stretch. It is good to remember that as tempting as it may be to pet or speak to a guide dog, the dog while in harness is responsible for guiding its owner, and should not be distracted from that duty.