the abused dog i took in is finally running and playing . wow , that 's great ! you did a great thing by taking in a scared animal ! i try ! i am just glad she is calm and nice ! thank god ! i did n't think she had it in her to play or even run . it is so nice to see ! it 's bringing a smile to my face just thinking about it ! : ) ) )
The cause of the joyful feeling is observing a positive change or behavior in someone ("she is calm and nice", "she had it in her to play or even run").