It was suggested to me today that Snoopy must be a time lord, since his doghouse seems to be bigger on the inside than the outside.

Apparently this is not the first time the idea has occurred to someone, since I found these pictures online:

There are other Peanuts meets Doctor Who images out there.

And there is at least one other obvious candidate for a time lord with a TARDIS:

See here for evidence not only that his garbage can is bigger on the inside than the outside, but also that he has regenerated!