#2 Ears
Ear shapes are varying from breed to breed. If your dog has relaxed ears or one cocked up or both are loose and floppy means dog is happy.
If they wear pinned back ears, it is a sign of aggression or fear. Ears pinned forward indicate that your dog is interested in something which is around them.
#3 Mouth
Happy dogs have smile on their face. Their mouth will be opened and some teeth may show up.
If your dog is not baring them and curling back its lips then it shows aggressive manners.
#4 Body
One of the easiest ways to tell whether he is happy or not is the way dog carries himself. A loose, wiggly body means dog is content and healthy.
Otherwise, if he seems tense, tight, they are not content and feeling uncomfortable.
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