Biting Shih Tzu

Question
This is sort of a two part question, so here goes.  I just adopted a 2 year old Shih Tzu from a local Shelter.  He seems to get along fine with me and most of my family, but when it comes to my husband, he is very moody.  Sometimes he will run to my husband with the love that only a doggie can display and then there are times when my husband comes near him, he starts to growl and snap at him.  

Last evening, he (the puppy) discovered that he knew how to jump up on our bed.  While I let him stay there for a while, when I took him off the bed he was fine.  This morning he jumped on the bed and when my husband tried to take him down, he went into full attack mode and bit his hand.  How can we resolve this before my husband decides that the pup has to go.

My second question is this, my puppy was spayed/neutered before I took him from the shelter.  He is now rubbing his behind on everything in the house and I don't know if he is in heat or itching.  How do I tell the difference and what can I do about it?

Answer
The second part is easy.  Most likely it is his anal glands or perhaps worms.  The vet can take care of it, or you could start with a groomer.

While I do all I can to encourage adoption, the truth is, shelter dogs often come with some baggage from their past life.  Small dogs often think big and are allowed to do as they please.  You may be unknowingly and your husband part of the time sending submission signals to him.  when your husband fails to submit to your Napolean, trouble.  The key to most behavior problems is approaching things using the dog's natural instincts. Dogs see all the people and dogs in the household as a pack with each having their own rank in the pack and a top dog. Life is much easier if the 2 legged pack members outrank the 4 legged ones. You can learn to play the role of top dog by reading some books or going to a good obedience class. A good obedience class or book is about you being top dog, not about rewarding standard commands with a treat. Start at http://www.dogsbestfriend.com/ For more on being top dog, see http://www.dogbreedinfo.com./topdogrules.htm

It is possible the rubbing is claiming the house as his too.  If the vet can't fix it, better leadership may.