Hello!
I'm looking for a book I read eons ago in elementary school. It was a YA book, I think, not a childrens book.
The protagonists are two housecats. They are brothers (Siamese breed? I'm not sure.) They are always interested in the outdoors. One can read, and the other has the unfortunate habit of eating things he shouldn't (like christmas tinsel). Early in in the book, they escape the house and go on a grand adventure around the city, meeting stray cats and participating in a kitty hierarchy.
At some point, the reading cat sees a flyer stating the "lost cats".
I can't remember how or why they went home. Only at some point they nearly drowned and had to swim a great distance (for a cat). When they get home, they are welcomed back, but there are two new kittens in the house. It is unsettling, but a balance forms.
And that's it.
That's all I can remember. No title or author.
Can you help me find this elusive book?