Be very careful if you intend to use one of these on a Deerhound, it is a shedding blade!between the teeth it is very sharp, so its geared to smooth coats , cats etc, also people could be over zealous and end up making the poor dog or cat quite bald , this has happened and my vet had to deal with a skin infection caused by this on a dog
The best brush for a Deerhound is a Mason Pearson bristle and nylon, not cheap but will last years and years, most show exhibitors of Afghans poodles etc use this lovely gentle brush that gets right to the base of the hair to the skin
I would not recomend the furminator at all for Deerhounds