Dog idioms in English language

• Dog-cheap:
  Potatoes are dog-cheap nowadays.
• Dog-eared:
  Children have made the pages of my book
  on tenses dog-eared.
• Dog-days:
  We are building a new house but we have stopped
  it during the dog days.
• Dog-sleep:
  The clever Mirchu was only having a dog sleep.
• Dog-headed:
  Advice to such a dog-headed man...? It's just like
  casting a pear before the swine.
• Dogged:
  He is such a dogged man...He won't let you have
  your share.
• Cats and dogs:
  It was raining so cats and dogs that nothing could be seen at even few yards.
• Cat and dog life:
  How long this cat and dog life will go between India and Pakistan?