Hi @LadyT, welcome to the forums, I'm new here too.
I find that being a dog-mother is both wonderful and also a responsibility. My current fur-kid is an adopted greyhound and she is a very lovely easy going girl. I also foster greys through a foster organisation getting the former (or so called failed) racers ready for forever homes. They really are a lifesaver for me, I have to put them first though, they are dependant beings needing *walks, suitable diet, veterinary care etc, so while the benefit for me is vast, the main focus of my care is not what they can do for me, rather what my responsibility is for them. Thats a great focus to take me out of myself and my worries too.
The pay off is that I have to 'show up' in myself everyday and put them first no matter how I 'feel' and be their guardian and carer and that is great for me to have someone to be responsible for. When I am unwell, I still make sure that they are well looked after, that would be my only concern for anyone thinking about getting a dog is a plan B for care if needed.
I certainly do love the uncomplicated love and attention and don't mind picking up their poos, mopping up their wees (when they first come they are rarely house trained having lived in kennels but they get it right quick).
The *Greys only need a little excercise too (15 - 30 min a day or every other day) being big couch potatoes 🙂
Happy deliberations whatever you do, think it through carefully and you will make the right decision for you and the prospective dog. I reckon its a great idea to thoroughly research the breed you are thinking about too because some have higher needs etc than others and an unhappy working dog who is not getting enough stimulation and excercise can be a stressor for us and not good for doggit.
Bottom line a dog is not 'therapy' - a dog is a life and a being all of their own who has needs too, it is a mutually beneficial relationship if done well.