Dew claws are a bit different...
Removing dew claws isn't just a vanity issue. It can be a preventive measure from future injury.
A dew claw is essentially an "extra toe" higher up on the inside of a dog's foot (you can see it here)
Because the claw never touches the ground it cannot be naturally worn down and if not carefully watched and maintained it can get caught in just about anything. Even if you do keep an eye on it and keep it well maintained, it can get caught on things.
I had a dog who got his dew claw caught in the knot end of a rawhide bone (this was several years ago when I though rawhides were okay treats)...he pulled the claw/nail right off! It just kept bleeding and we ended up at the emergency vet for a very expensive "surgery". His dew claw grew back.
I have a dog now who has several extra toes/dew claws. Unfortunately they were never removed and I wish they had been. They must be constantly checked and watched!
I'm not sure when the best time is to remove dew claws but after seeing injuries to them, it's a different issue entirely from ears and tails.