A deputy shot and wounded a large dog that charged him near an East County primary school Monday, a sheriff's sergeant reported.The patrolman was investigating a report of an aggressive dog wandering through Lakeside, menacing and chasing people, including a 78-year-old woman, when he spotted the animal in the back yard of a home in the 9200 block Lakeview Road, Sgt. Tom Poulin said.The lawman contacted a woman who lives at the home across the street from Lakeview Elementary School and was speaking with her in her driveway when the rottweiler-Labrador retriever mix, weighing more than 100 pounds, ran out of the yard and charged them, snarling and growling, Poulin said.When the animal got to within about four feet of him, the deputy fired two rounds, both of which struck the dog, which limped off into a culvert, the sergeant said.Animal control personnel were summoned to capture the dog and take it to a veterinary hospital. The canine was expected to survive, Poulin said.The deputy and the resident were unharmed. There was an unconfirmed report that the dog had bit someone prior to the patrolman's arrival.The shooting occurred about an hour before classes were to begin at the nearby elementary campus, at a time when schoolchildren were beginning to arrive in the area.It was the second time in a week that a San Diego County sheriff's deputy shot a vicious dog. Last Tuesday, a detective opened fire on a pit bull terrier that attacked him in a rural East County area near Morena Reservoir. That animal also survived its gunshot wounds.Medics treated the detective at the scene for dog-bite injuries to his left arm.