I think dewclaws are totally up to you - a lot of vets will pressure you to do it. I had it done on Angel at the same time as her spay, around a year. It was HORRIBLE. She had a problem with the sutures, got an infection, and so on, she nearly lost her foot, and has horrible scarring to this day.
The reason things went so badly, is that although Angel's dewclaws looked quite floppy, they were actually VERY attached (7 sutures per side). Had we x-rayed first, we would have realized that, and prevented this whole mess.
My vet still wanted to do Gage's as he also has large, loose looking (on one side, the other is well-attached) dew claws. I've refused. If we're going to be in heavy brush, I'll tape them (just wrap them with vet wrap). My vet feels that Angel's complications were unusual, and I know he's probably right. He removes dewclaws all the time with no problems. However, I choose to leave my dog the way he was born (except minus his nuts of course

).
I am NOT saying, don't do it, but be aware that there can be complications, and that it is relatively safe to leave them there, although you need to be more aware of them of course. If you do decide to do it, you may want to consider having x-rays done first, so your vet knows what he's getting into.
Good luck!