Do you 'know' the dog you are thinking of adopting? It may be worth going through a rescue and adopting a dog who has been with a foster. They may be able to answer more questions about the dog's personality and habits than a shelter.
For the most part we have always had a dog - or two. While I love my dogs to pieces there are times I have second thoughts about having adopted them. We had two euthanized fairly close together a couple of years ago and I jumped right in to adopting two more adult pugs.
I don't know how old you are but we are empty nesters and it can be tricky planning vacations or even a long evening out. Working around meals and potty breaks. One of mine isn't very cooperative when potty time comes around so I have spent many a night out in the snow or rain waiting and waiting for him to find the right spot. They are basically 'my' dogs so I never ask my husband to do this in nasty weather.
I'm fortunate to know a couple of young ladies who will dogsit at our house when we go out of town, but it has never been for more than a week.
With cats you're familiar with vet bills
Not trying to discourage you, but it can be a challenge.
P.S. my husband told me about someone he knows (retired) who decided he can now sell the family motorcoach. The dog died so now they can stay in hotels. Sad and funny at the same time.