Health Problems
Separation Anxiety was once thought to occur only in young children.  Did you know however, that many dogs suffer from this disease; that being left alone in the house for long periods of time causes great anxiety.  Anxiety that is usually displayed by scratches on the door, pillows strewn all over the floor or furniture damaged.
Dealing with this begins early in the life of your puppy.  Of course there are short term pharmacological solutions available from your Vet.
However, training and discipline are paramount, as is consistency.  The puppy must learn to entertain himself and  not expect to be constantly played with.
Only good behaviour should be rewarded.  Try and teach your puppy to be calm and patient.  Above all be consistent.  That includes all members of the family.
You will then have a dog who is quite content to be left alone.
Like cats and dogs
Why does your dog have trouble making friends with your cat?
When your dog lies on his back he is being submissive.  When he wags his tale he is excited or happy.  But your cat on her back is in a fighting position.  Her tail swishing is a sign of anger or frustration.  So when Rover sees Molly on her back, she is not inviting a friendly welcome.  Far from it . . .
Dr. Rover
Not only can your dog be a useful adjunct to the healing process, which is why dogs are routinely brought into hospitals.  Dogs have shown an uncanny ability to “sniff “out disease.  Anecdotal and empirical evidence has proven this.  Just recently in Baltimore, Heidi, a black shepherd-lab mix was able to discover cancerous tumours in her owners lungs.  And in a German hospital researchers have found that dogs can smell a large range of organic compounds that show the human body is not functioning properly and thus can detect early signs of cancer and diabetes.