Look at your dog's feet. Notice anything?
It's likely that its nails are too long.
Trimming a dog's nails is one of those chores many pet owners put off because of how awful the experience can be. But keeping nails trimmed is important. Long nails can make walking uncomfortable for a dog and even cause lameness. Nails should be just off the ground when your pet is standing.
To get more comfortable trimming nails, it's wise to learn a bit about them.
Each nail has a blood vessel inside of it, called the quick. When you trim a nail, you need to cut just beyond the end of this vein. If you nick the quick, it will bleed,
If your dog has light-colored toenails, you can see the blood vessel: It's the pink area of the nail. Black nails are harder to figure out, but you should be able to see the vein by shining a flashlight behind the nail.
If you can't tell where the quick ends, just clip back a little at a time. If you draw blood, take a pinch of blood-stopping powder, such as Kwik Stop, and press it against the exposed tip of the nail for a few seconds to stop the bleeding.
If your dog's nails are so long that they're forcing its foot out of position, don't try to trim them back in one go. Try cutting a little off every few days: The quick recedes as you go. But you may want to have your veterinarian clip them when your dog is under anesthesia, such as for a teeth cleaning.