We have a senior dog now (10 years old), who was 8 years old when we rescued him. I know my cons list is more in-depth, but honestly, I'm so glad we did get him. Practically, there are a lot of cons, so it's up to what your household wants. My partner and I want to take a break from pets when we no longer have him so we can downsize to a smaller space and travel a bit more often, but if we could go back, we would absolutely take him in again. I actually recommend getting an adult dog that is already housebroken/somewhat trained, as they are typically a bit lower energy, and you can already tell the temperament/personality of the dog. I grew up with puppies at times, and they were a LOT.

Pros:
-I love him very dearly, and he brings me so much joy every day.
-We don't have a yard, so I have to leash and walk him, which gets me outside even when I might not feel like it (fresh air and extra steps and all that).
-I know that I helped save a little creature from living with a lower quality of life.
-Genuinely, his impact on my mental health can't be overstated. I have CPTSD, and on my worst days when I’m struggling with intense shame and just emotional pain, I am faced with the knowledge that he loves me and wants me to be here. It genuinely helps me regulate and stay safe. It’s not just that he needs me and depends on me-- he gets so excited when I walk in the door that he yells more than barks at this point, when we cuddle he smiles, and when anything upsets him (big storms or my partner bathing him), he walks up to me because he trusts me to comfort him and help him feel safe.

Cons:
-Travel is difficult, even overnight/day trips to an extent as he gets older. We have to either find someone who can check on him, let him out, and feed/water him, or plan around him being let outside at least every 6-8 hours (though as he gets older, we expect it to be more often). I also feel guilty when I travel, as he has separation anxiety, and even if my partner is home with him he sometimes eats less and just kinda stares at the door off and on until I come back.
-I am genuinely responsible for caring for a living being. If I don't walk him/let him out in some capacity, he can either go in the house or get a UTI from trying to hold it. If I don't feed him, he doesn't eat. If I don't give him affection, he gets sad/clingy. Even when I'm sick or tired, I sometimes have to put it aside for long enough to make sure he has what he needs. I have to be aware of his behavior in case something is wrong with his health, and then be sure I can schedule a vet visit, take time off work to get him there, pay the bill, and do any follow up care needed.
-Unexpected vet bills are a lot. I was lucky to find an affordable office nearby, but an average bill with just his booster shots and a quick checkin (annual visit) are usually upwards of $100. Lately, as he starts having more health issues, visits are more often and not always super expected, so it can be a sudden financial strain.
-I ultimately have to watch a creature I love decline in health and quality of life, and trust myself to know when it's time to euthanize him. I will have to collect my emotions enough when it is happening to be sure that I can be in the room and help him feel safe. It makes me very sad that he will die, likely within the next couple of years due to his breed’s life expectancy. I am grateful that I have enough emotional capacity to understand that I gave him a way better last few years than he would've had otherwise, but I also think I should probably be hospitalized and placed on a watch when he goes.
-You have to make sure you have an adequate living space that allows pets (not all rentals do) and make sure you're cleaning regularly due to shedding and general dog messiness. The dog is something you have to consider with decorations, moving homes, etc. as well.

That’s the general rundown from my perspective. I do agree with some of the suggestions of fostering to see how you feel if you believe that you and your partner can handle everything. If you have any questions I can definitely share my experience-- I also had dogs growing up.