Puppies love to chew, and a cord can burn, shock, and even kill. Outlet covers should be used in all open outlets. Plastic bags are a suffocation hazard. Toilets and buckets of water are tempting to puppies, but can be both a drowning hazard and a chemical hazard if you use cleaners in your toilet tank. Basement doors, windows, doors to balconies, etc., should be kept closed and locked.
Puppies can dislocate bones, brake bones and die from falls.
Be careful when closing doors that you do not slam puppy in a door. Ashtrays with cigarette butts are potentially fatal. Cleaners in cupboards that you think puppy can not get into can be dangerous. Puppies seem to get into some areas that we just can not figure out how they got there. As with toddlers, keep all cleaners and other household poisons up high in a locked cabinet, to avoid an accident of this nature.