, Dogs(Canis lupus familiaris) are highly social mammals domesticated from wolves over 20,000 years ago, serving as loyal companions, workers, and protectors. Known for an extraordinary sense of smell , they have over 400 breeds ranging from tiny chihuahuas to giant mastiffs. Generally, they live 10–13 years and require consistent care. ASPCA ASPCA +5 Key Aspects of Dogs Lifespan: Pet dogs generally live between 10 and 13 years. Sleep Habits: While adult dogs sleep about 12–14 hours a day on average, they often adjust to their owners' schedules. Pregnancy: Dog pregnancy, or gestation, typically lasts about 58 to 68 days (roughly 9 weeks). Intelligence & Senses: They can learn over 100 words and gestures and possess a sense of smell 40+ times more sensitive than humans. Varieties & Types: There are over 400 breeds within the same species, classified by traits and functions such as herding, hunting, or companionship.