probably that he's been running around a lot and wearing down his nails faster than they can grow back.
My dog's toenails are not black. They are white. Not all dogs have black toenails. Not sure what made you think that but..........you are mistaken.
No.
Breeds such as Labradors, Rottweilers, Dobermans, and Boxers are known to have black nails. The color of a dog's nails is often related to the pigmentation of their skin, so dogs with darker coats are more likely to have black nails.
dogs
You could cut a small dogs nails with human nail clippers. Larger dogs nails would not fit inside the clipper so it wouldn't work. It is better to buy a set of clippers made for dogs though. They are made specifically for dogs nails and will work better.
they are called nails
Black or nude nails.
lack of calcium in your body causes white stripes on teeth and nails.
how do I get my white dogs hair back to white
All breeds may have black nails. Usually, dogs get black nails when they are not take care of properly.
That depends on the length of the nails and how much it hurts when they stand.
That depends on how clean you are and how clean is the dog, and in what environment each on of you moves. Yard dogs will have more microorganisms under the nails than a clerk, but a gardener will probably have more than a dog living in a flat.