Never leave a bottle on an end or coffee table, or a bedside table. A puppy can chew through a bottle in seconds and ingest the medicine inside very quickly. Cords on window blinds can tangle and choke or hang a puppy. Never leash a puppy in the house when you leave. They could become excited and tangle up in it, or jump over something and hang themselves.
Ribbons can be cute on a puppy, but again, can be a choking or hanging hazard.
They can tighten up unexpectedly, and even when you are right there, can often be hard to remove once this has happened. Some toys sold specifically for puppies pose their own hazards. Avoid toys with squeakers that can be chewed out. Only use these under your close supervision. When playing in your yard, make sure puppy does not try to swallow rocks.