I know you will give him a good home. Remember to walk him twice a day, and that he only likes canned dog food.

6 seconds sound clip from the Back to the Future Part III movie soundboard.

You can hear this line at 00:09:23.947 in the DVD version of the movie.

Quote context

[...]

- Once you have returned to 1985, destroy the time machine. Destroy it?

- Yeah. Well, it's a long story, Doc.

- Do not, I repeat, do not attempt to come back here to get me. I am perfectly happy living in the fresh air and wide-open spaces.

- And I fear that unnecessary time travel only risks further disruption of the space-time continuum.

- And please take care of Einstein for me. Einstein?

- He's your dog, Doc. Einstein is what you call your dog in 1985.

- I know you will give him a good home. Remember to walk him twice a day, and that he only likes canned dog food.

- These are my wishes. Please respect them and follow them.

- And so, Marty, I now say farewell and wish you Godspeed.

- You've been a good, kind, and loyal friend to me, and you made a real difference in my life.

- I will always treasure our relationship, and think on you with fond memories, warm feelings, and a special place in my heart.

[...]