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If you could do what you say here, then I think it's doable - only two days a week alone at home, with a dog walker/sitter on those days. That's pretty much my arrangement and it works. It means that on days he's left, he has to have a long walk (hour plus) first thing, with lots of chasing a ball or running with other dogs, and another one when I get home - but that's the best bit anyway.
Maybe crate-train the puppy from very young to make taking it into the office easier.
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I've had to leave my dogs with my ex as it wasn't feasible for me to have them given my working hours (which are still shorter than yours) - just wouldn't have been fair on them. tbh, the last year or so of our relationship I was staying with her for the sake of the dogs - this was not healthy. Really miss them, but at least we have decent custody arrangements and I get to see them a couple of times a week.
Not really fair on the dog