Even though the fine side is a blade technically, you don't have to worry about sharpness as it gave me no trouble on my dog. As long as you are careful to not pull your dogs hair the brushing process should never hurt. I feel confident in saying that this tool is safe for dogs or cats if used properly.
After use, Treasure's coat was as soft as if she had been at the groomer for an hour and I love that I can get that done here at home in between grooming cut times.
I received one for free in exchange for an honest and unbiased review.