If your ween is a Queen Ween in the making then we recommend the Fancy Pants Collar for those special occassions. 
For the perfect fitting collar please measure your pups neck giving two fingers of breathing room in the measurement.
Collar sizing: 
Small - 40cm / 15.5" Long and 3.2cm / 1.2" Wide 
Fits neck 30-37cm or 12-14.5"
Medium - 46cm / 18" Long and 3.6cm / 1.4" Wide
Fits neck 34-41cm or 13.5-16.5"