
I never did this myself for starters. Early days when I was breeding although I was out in Canada at the time, breeders in the UK used to take these off suggesting they got a neater front paw when this was done. After the first couple of litters, and really because my respected vet out there hated doing this, even at days old when they really didn't feel anything other than not liking being restrained while it was done, I stopped. Over there it wasn't done, as I remember in any case and gradually it was the same in the UK - especially with exporting hounds as most other countries didn't take them off.
I believe it really depends on the breed in terms of being necessary or not. My Whippet had hers taken off in the first couple of days. And for sure, a dewclaw injury later on, can be nasty.