The excrement of your own indicates the features of yourself which you dont like. The excrement of the other person signifies the issues of that person whose excrements you saw. The problems of this person have caught much of the stress for you as well, you are worrying about it as it would be your own life.
Dream dictionary: Excrement dream meanings
…To dream about excrement generally refers to improper and dishonest ambitions concerning money or property that is obtained by any means or that these are at risk of being lost, therefore, this dream is a subconscious warning concerning the risks you’re taking. When a young woman dreams about this, it implies that she longs to marry a rich man, regardless of his physical appearance, in case she accomplishes this goal, she would have a sad life….
To wallow in it, a change in social position is expected.
See the interpretations of feces.
Dream of excrements indicates abundances and economic achievements. Step on excrement means you will have a good balance in your economic situation.
…(Dung | Excrement) Manure represents money for one who eats it, or for one who collects it in his house or in a barn in his dream. Any animal excrements that are used to fertilize the soil, or if they are used as fuel represent profits when seen in a dream and particularly dried dung. Pigeons’ droppings, or the refuse of any type of fowl in a dream represent unlawful money. Cow dung in a dream is a sign of prosperity and a good harvest for farmers only. (Also see Droppings | Dung)…