As signs are only ways of communication between them, your pet needs to be trained to understand that.
Scratching, biting, barking, chewing, and digging are very common behavior of your pets. Every habit describes their behavior, health, mood, and state of mind. Being their owner, you need to study these things to find the perfect solution.
If you find your pet scratching, that means he/she must be encountered with some allergies, skin infections, or even flea attacks. To find the exact reason you need to check their skin and fur for the presence of fleas and ticks.
Study the behavior of your pet, spend time with them and meanwhile, give them training to learn good things to improve communication with them.