I do the dews and tails between 5 and 10 days old, but it can be done at 2 weeks. I prefer not to do it that late however.
But I would like to say there is NO real reason to do dew claws. I have never seen one tear that was kept clipped. In my opinion it is just cruel, and I personally hate doing it. I have done a lot of puppies and I am re-thinking doing it at all. The more research I do the more I am convinced it is not needed!
I recently read a great article in the whole dog journal that really got me to thinking. God gave them 5 toes for a reason. like he gave us thumbs and little pinky toes..I don't think it would hurt us to have them removed, we would get used to it..Just like dogs do.
But if you have an older dog with dew claws, just leave them alone, that would be like taking off a thumb to you or I.. They are used to having that extra toe. If you keep the nail clipped it's not going to tear, probably wouldn't anyhow.
My dad was a hunter and had many hound dogs, they always had dew claws! He hunted them in dense woods and NEVER had them tear. People tell you this is done for their safety, it just isn't true.. People honestly just do it for no good reason because it has been done forever..