The reasons why dogs smell strangers’ legs:

1. Generally, dogs identify people through smell. If a stranger has the owner’s smell on his legs, the dog will come over to sniff the smell.

2. The dog may regard a stranger as its owner, and the dog's smell is acting coquettishly towards him.

3. When your dog wants to get closer to you, he will sniff your legs first to confirm your scent.

When a dog sniffs you at your feet, it usually means no harm, so don’t panic too much. You can just stand still. It won’t take long for them to stop this behavior. If you have free time, , you can also play with this dog.