How does webbing increase propulsion when a Catahoula swims?

Answer

The webbing stretches during the power stroke, capturing more water

The anatomical advantage comes from increased surface area; during the backstroke motion (power stroke), the webbing stretches out, capturing more water than bare toes could, thereby providing a stronger thrust forward.

How does webbing increase propulsion when a Catahoula swims?
DoganatomybreedCatahoulaWebbed foot