The document summarizes the top 5 largest dog breeds: 1. Saint Bernard, a working dog from the Swiss Alps that can weigh up to 117 kg and stand 27-35 inches tall. 2. Mastiff, the second largest breed that can weigh 68-110 kg and stand 30 inches tall, known for their courage and dignity. 3. Neapolitan Mastiff, considered the 3rd largest at 26-31 inches tall and up to 74 kg, known for their protective instincts. 4. Newfoundland, the fourth largest at 60-70 kg, known for their strength and water rescue abilities. 5. Dogue de Bordeaux, also known as the French Mastiff, the fifth