You can obtain the fourth Diary Entry as soon as you buy the Frame. The picture features Spud, Moose, Anko, a cat presumedly CoCo and an unknown cat either playing or sleeping on a cat tree.
Entry[]
Cat tower complete!
I'm glad everyone's having fun.
My friends were shocked I made it from furballs! Haha
Japanese version[]
ねこタワできた！
みんな楽しそうでよかった。
ねこ毛１００％タワーって知って、友たちの顔がわすれらないw
Translation[]
Cat tower complete!
I'm glad everyone seems to be having fun.
I'll never forget my friends faces when they noticed I made a cat tower 100% from fur balls, haha.