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Dogs should not live in excrement and urine soaked filth.
These people obviously have more dogs than they can handle. They should try to find a new home for at least the youngest and healthiest dog, or, for the most purebred dog - most breeds have rescue societies to find homes for needy pups. They might try to do this with TWO of their dogs.
The remaining dog(s) could be kept closed in one room when the couple is out, and then they can walk the dogs when they are home.
Then they need to learn to train a dog - which makes the dog healthier and happier. If the best they can do is a lame-assed "They are pretending to be house trained", they should find new homes for all three dogs. They can have a pet when they are grown up adults.
It's one things to be a victim of your own slovenliness; it's quite another to make innocent dogs your victims.