Have you changed their diet? Have they been sick? Have they been on antibiotics? All of these can effect their defecation color. My cat was sick and had tarry red diarrhea, but we got her on antibiotics and it turned green. Also, most of the time green feces normally mean that iron is not being absorbed from the food or an increase in iron intake. It depends.
You should already have at least one litterbox for your cats to use and normally, unless you have more than three cats, one litterbox is enough.
one litterbox per cat
Cat owners that keep their cats inside still need to be concerned about their indoor cats carrying bugs. Fleas seem to be a common issue for indoor cats.
domestic cats
Indoor cats and outdoor cats are the compound subject (not including the and), and require is the verb.
They probably just stepped in something smelly, a litterbox maybe?
Cats will avoid a litterbox that is not very clean and fresh smelling, so your cat found a lump or a wet spot, and couldn't wait to get away.
indoor cats yes, outdoor cats **** no.
They are not dogs, they are cats. Are they indoor cats? Some people do keep them as pets but they take a lot of work as they are more to the wilder side of the species then a normal house cat
cats that can't be bothered to get up.
Yes, indoor cats use litterboxes.
I doubt it.