Which historical period caused the greatest existential threat to the breed?

Answer

The two World Wars

The mid-20th century, specifically the period encompassing the two World Wars, represented the most severe crisis for the Welsh Springer Spaniel population. These global conflicts caused massive societal disruption, leading to scarcity of resources, stalling of dedicated breeding programs, and forcing many enthusiasts serving abroad or otherwise preoccupied to abandon their kennels. Following World War II, the breed reached a precarious state, being perilously close to complete extinction with only a tiny fraction of purebred specimens surviving, necessitating a massive international rescue effort.

Which historical period caused the greatest existential threat to the breed?
evolutionDogbreedspanielWelsh