Which historical event led directly to a sharp decline in the Otterhound population?

Answer

The outlawing of otter hunting around the 1960s or 1970s.

The breed was developed specifically to hunt river otters to protect vital fish stocks; once this hunting was banned, the need for the breed largely vanished, causing pack numbers to drop.

Which historical event led directly to a sharp decline in the Otterhound population?
DogpetbreedcompanionOtterhound