When to trim tail of welsh terrier pup?

The tail of a Welsh Terrier pup is typically trimmed around 3 to 5 days after birth if it is being docked, as this is the standard practice for the breed. If you're considering grooming for aesthetic reasons later on, you can trim the tail when the puppy is around 8 to 12 weeks old. Always consult a veterinarian or professional groomer to ensure the procedure is done safely and humanely.