Are your dog's, cat's or bird's nails or claws just a little too long? It's quite possible that they don't engage in the type of activities that naturally cut down their nails. If that's the case, your pet's nails need trimming. Imagine how unpleasant it can be for your dog, for example, to walk around on paws with nails that are simply too long? And after all, what's unpleasant for your pet ultimately ends up being unpleasant for you!
When it comes to cats, their claws are quite useful: they help them to mark territory, to defend themselves or catch small animals in the wild, to get around (especially when climbing trees), and to maintain their balance. Claws also come in handy when cats want to play or stretch. Of course, if your pet cat never goes out and always lives indoors, many of the ways they normally find claws useful don't apply: they don't need to fear predators or chase birds or mice; their claws aren't needed to defend or attack. But they do continue to grow? and your pet will need to claw at things (furniture, fabric, various objects) to remove the worn outer sheath of the nail/claw to be replaced with a new one.
Claw size is just as important for birds: canaries, parakeets and parrots are often brought in to the vet with extremely long and curved claws!
Therefore, it's extremely important that your dog's claws be trimmed regularly, particularly to prevent the vein inside the claw from growing too much as well.
You can trim your pet's nails/claws with an appropriate clipper about once month, as needed. However, if you prefer to have your vet do this for you, they will be happy to do so. After all, they are a professional.