In an entry for the second month, sixth day of the same year (March 11, 889) titled For the Love of a Cat, Uda gives a detailed and humorous description of the physical characteristics of his cat and goes on to ascribe her a yin and yang spirituality.
This is an incorrect translation, though the original is similarly cute, see here:
https://www.linfamy.com/p/this-popular-cat-loving-letter-from
The above is roughly in line with the published translation.
The emperor sure is defying XKCD's "cat proximity" theorem.