If both of you aren't on board with the idea, it's only going to cause problems and it's truly unfair to do that to the dog if he/she either a) has to be sent back to the shelter or b) is a part of a household where he is not made to feel loved/wanted by one of the primary adults.
Also, adopting a dog is a long-term commitment. We're talking 8 - 15 years depending on the breed. Really, really give this idea careful consideration and think what's best for the dog.
The vet bills are another consideration. It's tough enough with one dog. I have four. The vet bills, she is not pretty.
I love my beasties even when things get crazy. I do not look forward to the day when I have to say my final goodbyes to each of them. However, I do look forward to the freedom that being pet-free will offer. I'll be putting myself on a two-year moratorium prohibiting me from adopting any more pets so that I can be free to travel more often.