Ans: Ideally, a dog’s nails should be of a length where it receives traction when it digs its paws on the floor. In other words, the nails should not touch the floor when the dog is on all fours on an ever surface. But, the nails need to touch the floor when the dog starts a gallop or when it is on an incline. It is important to note that the nails need to be cut at the right angle in addition to the desired length.