Pat Flannery writes:

Jeff Findley wrote:
You're right. I forgot about Voskhod 2 needing to only have a crew of two to
support the EVA.


One Voskhod mission that got canceled was to be a precursor to Leonov's
spacewalk in which (I kid you not) a dog was to perform a EVA.

Of course, you have to walk the dog. Developing an outer space canine
toilet would be foolish.