it is good you are thinking about it first.
initial thoughts
lots of rescues will not rehome where there are children. Not all, but many. Also rescued dogs may involve additional work - they may have behavioural issues. Again, not all, but you need to go in with your eyes open.
You know your kids now, but they do like to change 😂 I knew when we got dogs that ultimately it would be my responsibility to ensure it’s looked after and walked daily. I have to pay a dog walker for the days I am working. My dog personally wouldn’t cope in daycare (he’s too nervous). And between kids/ school runs/ work etc any weekday walks by one of us are a bonus.
they need walking/ stimulation daily. So only walking once at the weekend may be an issue (it depends on the dog). An unwalked dog is more likely to behave ‘badly’ (find something to chew etc) but in that case it’s not the dogs fault. My dog can cope with a day of not being walked, just, but he’s climbing the walls on those days and I still have to find time to play games with him in the garden to expand some energy.
they are a massive tie. Going out for a non dog friendly day trip at the weekend? It’s up extra early to walk the dog (a good log walk so they are settled) and also they need someone to come in to let them out for a wee. Going on holiday abroad? My dog won’t cope with kennels. I have to find a housesittter or friend that the dog knows. And he misses us. Ditto weekends away we have to go somewhere dog friendly.
these are just the tip of the iceberg. There’s vets visits, grooming visits (depends upon the breed), plus associated costs (and costs of feeding them (mines fussy!), dog walker, house sitter, flea and worming etc).
lots of websites will give you ideas about typical dog breed characteristics and you can often filter to find suggestions based on what fits with your lifestyle. Consider if you want a dog where parents have been health tested, as many breeds are prone to conditions developing. And vet bills are eye watering (as is pet insurance).
I LOVE having the dog but it does impact on your lifestyle, your ability to be spontaneous, and your wallet. If you’re not 100% sure I wouldn’t. For those reasons I suspect once DDog is gone (hopefully not for a good while after living a long and happy life) he will be my last.