A light advice piece in CNN.com's Living section shows women nurturing their husbands too much, to the point of treating them as babies. The experts they cite note that while this can work for some couples, it is generally a bad idea as it makes the men helpless and incompetent, or resentful. Or both.
What surprised me about this account is that they did not indicate whether these couples had children. A wife who babies her husband (or dog, or the neighbor's kid) would seem to me to be sending signals that she is very ready for children. If she continued to baby her husband while also babying her baby, then I would worry.