Because the judge would rather you two settle it than go to trial.
The judge would rather believe that you have not settled because both parties are just being difficult. This is not always true, as sometimes one party is just being unreasonable. If one party just will not budge, and it is over a "simple" matter, the only way out is for it to go to trial. Which is expensive.
There is a reason why we are asking if any of the children are mutual children. Yes, if they are willing to argue with you over a dog, but not mutual children, that is a different situation than if the kids are not mutual, but the dog jointly owned.