I had one teenager who was good at keeping his room tidy (not that clean, but tidy)
I also had two other teenagers who lived in pretty awful conditions. One was a girl and her room stunk of perfume stuff. The other a boy whose room stank of smelly running shoes. (I think that maybe the dog smell you referred to?)
I gave up hassling them and just went into their rooms every week and cleaned them and changed sheets, picked their dirty clothes off the floor to wash (although they would often get their dirty clothes into the clothes hamper).
I did have success though, giving them one main housework job they had to do each week. One vacuumed all throughout the house, the other cleaned the kitchen and the third cleaned the bathroom. They could swap jobs if they wanted but they never did. I used to have to clean those rooms again midweek, but overall they did a fairly good job.
I really not sure why they couldn’t clean their rooms but could do one large job household job a week. They did give me the argument that it was their room and they could live in it how they liked. That argument did not work for communal areas we all shared so….. Anyway, it was a small win for me.
Today the neat one does all the housework and cooking in his household as his wife has to put in more hours at work than him.
Daughter is more traditional and carries the bigger load of work, home care, child care. I wish her husband would step up more, but in other ways he’s a very good husband.
My other son shares housework, childcare with his wife and both work hard outside the home. I think she does more real cleaning than my son, but he does more cooking etc.