[HighlandYorkies]

I hate to say it but this might be your problem. Why should a bit of poop on the floor come before the quality of the dog's life ?
You are crating at night - fair enough....but then once the dog has already slept crated at night - think how bored he/she must be while crated during the day as well. Put yourself in the dog's position.
This might be a behavioural/boredom problem.

I am glad you have a pal for this dog, as that should help the dog when left, but really I would think of why you have dogs in the first place if they just HAVE to be crated so much of the time, and you are working.
Do you do any of these, or have you considered trying one of these ?
A dog-sitter
A dog walker
A neighbour or relative or dog lover who will come and let the dogs out and spend some time with them to break up their day ?
A neighbour, relative, dog-lover who they could go and stay with while you are at work.

I also have cats and a cat tray - I have them in the other half of the house to the where the dogs are left, and a closed door between both...problem solved.

The next time you have holidays why not try to get the dogs into a routine of going out, then being left for say 10 mins free range in part of the house, and increase the time they are left ? Put away any hazards and leave a water-bowl. As you leave give them a biscuit each, and they will soon know the routine.
Just a suggestion....all I can say is that mine don't leave any pee or poo, and they are all tiny at 4lbs, but then I never leave them more than three hours without attention, and then only rarely.

I'd rather give them more time and exercise than come home to issues like you are having to deal with after a hard day at work.

Good Luck in finding a solution.....Debra x x x