Answer and explanation:
1. 'I' refer to the dog as you can see through the poem.
2. It is chained because the children, family bought the dog but not let the dog go with them, not play, walk with the dog.
3. They promise to feed the dog, promise to walk , brush the dog everyday
4. The feelings of animales as it sits to a chain is like: Just imagine you are a person and you are chained for the whole day long, sometimes without anyone given food or water, how would you feel?
Hope this helped !
Ps: This is my work, no copy or plagiarism!