At the very end of the movie Marley is put down due to health issues. Although it is very sad he dies peacefully in a vets office. Him and his owner have a moment of friendship and gratitude where you can really see his love.
A girl is stabbed in the movie, prompting the main couple to move to a safer environment. The stabbing happens off-screen but she screams, Owen Wilson’s character runs out to find her wounded (there’s some blood on her side) and she describes what happened to her.
I don't know why people are saying no - a young girl gets stabbed on the driveway which is why they move away- not sure the timeframes but the girl screams and John runs out.