haha, you probably don't want to hear it, but I'm going to speak on the side of your hubby.
While he might have been cool being a multiple dog person before, the absence of additional dogs in the house might be very peaceful and pleasant to him, and he may be getting quite used to having only one dog.
That's happened with us. We've always had Cabeza, and usually one (or more) fosters. When I adopted Mable, Mark wasn't super happy about it, but understood why and didn't grumble too much. He quickly fell in love with her (and she with him). After she passed, we kind of agreed, "no more dogs for awhile". Now that we're back down to being a one-dog household, its become very comfortable and easy to deal with. Granted, Cabeza is the perfect dog in almost every way. He's very very very mellow. But the point is, the poop is manageable, the food is manageable, when we go to the park or wherever, that is manageable. Everything has become much more manageable with one dog.
I know that there are plenty of people on BPO that say that its not that big of a deal to move from one to more than one, and I agree that in some ways it isn't. But I also know how its been both ways, and I must agree with my hubby. Having just one has become very comfortable and easy to deal with, and even I have decided that I'm OK being a one-dog household for awhile.
I know that I will want another in the near future, but it is nice to just enjoy Cabeza and dote on him and spoil him and not have too much else to worry about. (well, we also have three cats, they can actually be a total handful!)
So, anyway. All I'm saying is that hubby might just be getting comfortable with the idea. Maybe you should just accept it and enjoy Tani and enjoy hubby's contentedness. (is that a word?)