Why must owners treat a leash as a permanent safety feature during walks for a Puggle?

Answer

Their desire to follow interesting scents can override known training commands.

When a Puggle catches an interesting scent from its Beagle lineage, the desire to follow it can become all-consuming, overriding commands they otherwise know.

Why must owners treat a leash as a permanent safety feature during walks for a Puggle?
DoghybridcharacteristicbreedPuggle