They are probably trying to make a "nest" out of the carpet the way they would if they were wild living in the woods.
It certainly is possible to scratch it, but this stand is scratch resistant and won't scratch easily - but almost nothing out there is really "scratch proof". Generally, no it won't scratch easily.
Usually you can see them when they go to the bathroom or they scratch their butts on the carpet or grass you can get the medicine from the vet and give it to them yourself
yes
They like to sharpen there claws on it and mark there territory.
They itch. Don't you scratch yourself when that happens. Also your dog may have fleas.
Dogs often roll around on the carpet as a way to scratch their back or relieve an itch. They may also do it to spread their scent and mark their territory. It's a natural behavior for dogs, and they might enjoy the sensation of the carpet on their skin.
Depends on the dog
You can protect your door from scratches caused by your dog by installing a door scratch protector or training your dog to not scratch the door.
because it does
Yes
My best bet is that he misses you :)
Yes, bears are known to leave scratch marks on trees.