Its also worth thinking about how long they will be left in reality
Whilst I work 9-5, if I was solo my dog would be left longer than that. Im out 8-6 commute wise, but realistically sometimes I stop for a chat with a colleague, work late etc. You'll also be adding every time you stop for fuel, something from a shop
When its just me and the dog what I struggle with is the lack of doing things on the way home like being able to do a shop etc, hair cut, things like going out for a drink on a Friday with work colleagues.
I also then cant leave them again in the evening if they've been left for most of the day so things like meals out with friends, food shops, clubs, cinema etc all have to happen on a weekend
I wouldn't be able to do it working full time and solo. With two of us, one can make sure that they are home while the other one goes out if the dogs been alone too long.
With a child, you might find that you arent coming home between clubs or are going out in the evening.
The other thing is whole day activities. We have to have dog care for things like whole days at the beach, zoos, city trips, theme park type days
In the winter you end up stuck because kids want to do indoor stuff which dogs arent allowed to and in the summer its too hot for them to come with you all day. This is especially true with something like camping. We are going camping in August and arent taking the dog because last time we struggled to find airconned spaces and it was too hot to be outside
We are lucky that my parents are happy to have them for a day otherwise that cost adds up
An older dog tends to be more chill but have more toileting needs. We have two. once we were able to do more when the younger one was finally older enough to be left more significantly or walk long enough to come out for the day, the older one suddenly could no longer come out for the whole day but equally didn't have the bladder to be left.
In terms of cost
Base wise our dog food per dog is about 40 a month
Insurance is 40
Something like kennels is about 250 a week
Check how much a daily dog walker would be, and dog care for however often youd need it
Not to scare you but our older dog isnt insurable anymore and is on about £300 of meds a month and very expensive food