Cat Issues

[Lookat63]

We have a two year old fixed male Devon Rex breed cat. Devon Rex's are very vocal cats. I have a three year old, and one on the way in January. We also have a Doxie and German shepherd that we've had for 10 years, respectively. The cat is a very sweet cat, but has become so obnoxious with wailing and crying all day and night, and he has started to refuse to use his very clean litter box. We've tried to put him outside, but he just cries louder. The dogs have become irritated with him as well, and try to get him to stop (sweetly though) no one is sleeping, everyone is irritable. We've taken him to the vet, they don't have any ideas, they say he is physically healthy and has a psych issue. I'm at the end of my rope here, any ideas appreciated. He just started this behavior out of the blue, he seems stressed. He's only happy if carried constantly, which will be an issue here in about 5 weeks...

[nettster]

I have a few questions with the litter box issue you are having. 

What kind of litter do you use (what brand also)? 
What kind of litter box do you use? 
Where is the litter box situated in your house? 

Has there been any incidents that would have over-stressed him lately (anything that even doesn't seem to make sense can be very helpful in this, no matter how small.)? 

For some reason litter box issues seem to be my strong point. my uncle(who is 83) had a 14 year old cat stop using her litter box, a switch of the box type and a change of litter type and she was back to the box. she didn't like the tall back on her old box and the clay litter started getting stuck in her paws and due to her age she had issues getting it out.  

- I should also add here i did go through school for it and worked in the veterinary industry ;)

[kimble]

how many litter boxes do you have? The general rule of thumb for multi cat houses is litter boxes = cats +1, to make sure there is always a safe and empty box and cats can't intimidate one another into not using the box. signs that we see aas nothing cats can take to be very stressful - a dog watching while he does his business may be enough to make him uncomfortable.

If you only have one or two boxes, I suggest trying to get another for a total of 3-4 scattered throughout the house. Yes it is inconvenient to have litter boxes everywhere, but it's even less convenient to have messes everywhere, and once kitty finds a safe spot and routine, he may stop using certain boxes and you can remove them. If you can, put at least one of the boxes in a place that is quiet and hard for the dogs to reach.