Maybe because it has fleas.
If no fleas or other bugs, get to the Vet for exam for mange, as it must be determined by microscopic exam. Early diagnosis and treatment are crucial.
probaly because of fleas or because it smells
Your dog may be pooping more and sleeping more than usual because it is getting sick. Your dog may also just be getting old.
its sick take it to a freaking doctor
it makes you a buttsniffer
If the dog is lays around for most parts of the day. If the dog drinks more water than usual. If the dog pants more and seen tired, sort of like it would look after a long run.
This dog needs regular exersize. This will discontinue the nervous chewing and scratching.
When a dog drools more than usual this is a sign that something is wrong. The dog may have an object lodged in his throat or he has a broken tooth that is giving him pain or discomfort. Your pet should be checked by an veterinarian. Here is a website that talks about drooling. See links below.
Scratching a dog behind the ears indicates nothing about the dog; it only indicates something about the person who is scratching the dog. Perhaps the person is the alpha male.
Because the cold weather makes the bladder more sensitive, and the dog will need to pee more than usual, so its more cooperative
Flea's which dog's have
Discipline my friend
give it food
The dog has been scratching and has scraped away some of the skin.