I'm so sorry. I got called away to an emergency for a dog whelping.
The area needs to be cleaned with a good enzymatic pet odor remover. Nothing else really does a good enough job. Bleach is pretty effective but not 100% and bleach sprays usually are watered down. An enzymatic cleaners break down the protein in the waste and that eliminates the odor. Dogs' noses are so sensitive that if even a trace remains it will draw them back to the place to eliminate again.
Most dogs who are defecating in the manner you indicate often have parasites such as worms or protozoan infections like coccidia or giardia. These make it harder for a dog to hold their bowels and does create softer stools in many cases. With protozoan infections, the stool can be different consistencies even in the same day. I'd go ahead and get a stool sample into the vet and have it tested for that.
Now if you are sick, the dog knows this. It may be his way of testing your authority as well. He eliminates where he wants to because it is his place not yours anymore. Dogs are strange in that way. Him eliminating in the area makes it his. About all you can do is clean it well and start up obedience training or refresher training to help reestablish the humans as the boss.
You might restart his house training using the same methods as you used when you first got him or you might try crate training. Here is a site with more information on crate training.
This is how I house train all my dogs. In addition, put a bell or other noise maker on the door low enough for the dog to reach. Each time you take the dog out, ring the bell. The dog will associate ringing the bell with going out and one day ring the bell to signal to you that he needs to go out. Perhaps before the illness, he was taken out more or had an easier way of letting you know that isn't as effective now that you are sick.
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