Why do large dogs make a thumping noise when they smell?

Large dogs don't actually "thump" when they smell. What you're likely hearing is a sneeze or snort.

Here's why:

* Strong Smells: Dogs have a highly developed sense of smell, far more sensitive than humans. When they encounter a very strong smell, it can trigger a sneeze or snort as a reflex to clear their nasal passages.

* Nasal Anatomy: Larger dogs often have longer snouts, which means they have more space in their nasal passages. This can make the sound of a sneeze or snort more pronounced.

* Excitement: Sometimes, dogs will snort or sneeze when they're excited or playful, even if the smell isn't particularly strong.

So, while it might sound like a "thump," it's actually just a dog's way of reacting to strong scents!