It is not clear what sparked the attack. Mastiff dogs are not considered a dangerous breed. “The child’s grandmother, aged 70, intervened but, was unable to release the child. The child’s mother arrived and fought the dog off the boy,” police said in a statement.“He and his grandmother were taken to Deniliquin Hospital ...astiff dogs are not considered a dangerous breed. “The child’s grandmother, aged 70, intervened but, was unable to release the child. The child’s mother arrived and fought the dog off the boy,” police said in a statement. “He and his grandmother were taken to Deniliquin Hospital ...