my pack sad and i dont want it to be sad what do i do

Pack Happiness is affected by:

Dominance levels - all pack members must be a different dominance level. This can be changed by adding character points (CP) to your wolves' dominance.

Hunger/Thirst - you can feed/water your wolves by heading to Pack > Food & Drink.

Affinity - The "Your Affinity: [x]" section is especially important. If your wolf is not of Good or Excellent affinity, then it will bring down your pack happiness.

As an aside, pack happiness only affects how quickly your wolves regain their health. It doesn't affect much other part of gameplay.