Am I a dog?

I read a book called am I a dog. This book was mainly about a dog become a human and live with bunch of people.
So the main charcter of this book is a dog. He lived with his family. One day his grandfather passed away. The last hope of the grand father was to meet human. From that time The main charcter was intrested in human. He was crazy because of human. So he escape secrectly from his house.
After long sleep he woke up and he notice that he is in human world, also he notice that he is a human boy.
Some women adopt him so he lived with that women.
He met lot of good people and he notice that his family also became human because they want to look for him.
In the end he leave his human family to find his real family. I think this is a really sad book. I hope the main charcter find his real family.