You can usually tell that a man is good if he has a dog who loves him.

Dogs have important jobs, like barking when the doorbell rings, but cats have no function in a house whatsoever.

I'd hope that the story A Dog's Purpose helps everyone reflect on how many different "lives" we all live - from children to teenager to adults to seniors - and how each phase of life presents new situations along the way to discovering our ultimate purpose.

Some people just don’t appreciate having a dog around. It’s sad to think there are people like that. I knew Gloria was that way—maybe that’s why she could never be truly happy.

I think one of the wonderful messages of A Dog's Purpose is how difficult it is for humans to master love without making it a muddy mess. God invented love and it is therefore perfect, and dogs are better at celebrating this perfection than we are. When in doubt as to how we should feel, we could do far worse than trying to live life like the dogs.

Dog’ is ‘God’ spelled backward; you know that. That’s why you’re here, to help the nuns do God’s work.

My purpose, my whole life, had been to love him and be with him, to make him happy. I didn’t want to cause any unhappiness now—in that way, I decided it was probably better than he wasn’t here to see this, though I missed him so much at that moment the ache of it was as bad as the strange pains in my belly.