If you decide not to. Why? Not that you owe W an explanation. But why not? Remember you are detached. If she wants to try to rekindle a relationship with a dog, so be it. I think showing that you care is counterproductive to your mission. Don't make it a "thing". Just my take.
If you decide not to let her take the dog for a few hours, I would take Steves advice.
M 53 W 54, M since 98 D15, D19 8/2013 discovered EA, W maintained contact with OM until 10/14 7/2/17 W said she wanted S, 7/25/17 moved out of MBR 12/17 W says moving out 5/18, W still in home.