litter box issues and avoiding

There is nothing wrong with any of my cats. Blake the oldest and a very large in size not weight, cat. He likes to poo in the shower tub, when he was young I assumed it was the fact the litter box was on the other side of the house. As he got older he did it less, but recently he's been doing it, and my new kitten has learned the habit so now they don't use the box at all. Which idk what to do, I even tried tapping the curtain shut and putting the litter box outside of it. They ripped the curtian. So I put the box outside the bathroom and shut the door. They poo on other things and not in the nice clean no lid litter box...should I buy some fancy training litter with a cat scent to draw their attention? They don't seem to be peeing out of the box just poo.

Cats poop outside the box for various reasons. The most common are pain (from constipation or from musculoskeletal pain of various types) and anxiety (usually stress or terratorial). The third reason is simply that the box is dirtier than they feel comfortable using, or that one cat is preventing another from using the box.

It sounds to me like Blake may be having issues of the sort described above, and that the kittens are getting the scent of Blake's poop outside the box and thinking that that's the right place to go.

Start with an enzymatic cleaner to remove all traces of the misplaced poop to the cats' sensitive noses. Then go through the list of reasons. Are there enough boxes (ideally one per cat plus one extra, and placed strategically throughout the house - quiet locations are best, and at least one per floor is recommended). Are the boxes clean enough? (Would you want to use a loo that the previous person hadn't flushed?) Can the cats easily get into the boxes? (Like people, cats can get stiffer as they age. This can make getting into a deep litterbox harder. Try a shallower box, or one that dips at the front for an easier entry). If these changes don't help, then a vet visit is in order to identify any physical causes (depending on the exact situation, a vet might be my first option - just to rule out physical causes).

This articles may help too http://www.thecatsite.com/a/litterbox-problems-in-cats-the-ultimate-guide

I live in a small apartment and there's no way I can get more than one box in here. I have 3 cats the other one use sthe box minus the kitten who uses it only half the time. Is it possible the box is to small? It's medium sized but my cat it a large long bodied and long legged cat. The size of a medium small dog or a baby panther as we like to call him. I didn't really think about it. Buy could that be an issue

The size of the box could definitely be an issue, as well as only having one box for three cats. Isn't there a corner or a hallway where you could squeeze in at least one more? How about the shower stall when it's not in use?

A lot of cats won't defecate in the same box they urinate in.

It's a a very open layout. The kitchen, dinning room, living room, front entrance is one big odd shaped room, the hall is narrow and doors an all sides. Hubby refuses to allow litter box in master room or bath so its in guest bathroom. I have a guest room, but that's the nursery since we are tryins to have baby and I don't want a litter pan or cats in that room

Wouldn't putting another litter box or two in an "inconvenient" location be preferable to cats eliminating outside the box, especially if you may have a child crawling on the floor some time in the not-so-distant future? Have you looked into litterbox furniture to disguise boxes? It's a solution many members have used, whether ready-made or DIY.

The litter box furniture may not be large/tall enough for your cat.  I have one (I love it) also open areas and not space for litter boxes.  But I have seen pics on-line where people have used cabinets or Large toy boxes and cut holes in them to hide litter boxes.  I've also seen where people have a table along a wall and put the box underneath and cover the table with a cloth so the box is hidden.  I recently had to relocate a litter box to a hallway.  I got one by cat condos.  It is pretty big but I'm not sure the cats like the cover.  So it is currently coverless, however the cover makes a fun tunnel (leaning against the wall) and doubles as a cat scratcher.   The cats also enjoy walking along the edge of the box. The larges one is big!

 Here is the link:  http://www.overstock.com/Pet-Supplies/New-Cat-Condos-Litter-Box-Enclosure/6291876/product.html

Can you try using a storage tote bin? I use a 35 gallon one with a hole cut into one side. Do you use scented litter? He might not like scented litter. I'll be leaving a link to a blog post by Dr. Pierson. Also have you tried Dr. Elseys litter? I hear it is good but I've not had to try it. Its quite a bit of information on this site, but its well written out. http://www.catinfo.org/?link=litterbox