Damage this, damage that, select this bad gene, that bad gene, and you get yourself docile floppy eared dog with the IQ equivalent of severe mental retardation, compared to a wolf.
Many breeds of dogs are certainly very dim compared to wolves, but I'm not so sure that some aren't just as intelligent, perhaps more so. It can be difficult to evaluate the relative intelligence of dogs and wolves, because some of the hallmarks by which we measure the most intelligent dogs (such as the complexity of tasks they can be trained to perform) do not apply to wolves because they're so much less cooperative.
Considering the intellectual tasks the smarter breeds of dogs are capable of though, I wouldn't rule out the possibility of eugenic selection for intelligence relative to wolves, for e.g. border collies, standard poodles and such.
Wolves are under strong selection pressure as well, though.
Intelligence comparisons are of course tricky, but one could compare brain volumes as a proxy, and the comparison is not in favor of dogs.
Thing is, of possible mutations within any gene (coding for a protein), vast majority cause loss of it's original function. This makes the speed of evolution dramatically dependent to the specific details of how the change is accomplished.
A long blog post explains why the author, a feminist, is not comfortable with the rationalist community despite thinking it is "super cool and interesting". It's directed specifically at Yvain, but it's probably general enough to be of some interest here.
http://apophemi.wordpress.com/2014/01/04/why-im-not-on-the-rationalist-masterlist/
I'm not sure if I can summarize this fairly but the main thrust seems to be that we are overly willing to entertain offensive/taboo/hurtful ideas and this drives off many types of people. Here's a quote:
The author perceives a link between LW type open discourse and danger to minority groups. I'm not sure whether that's true or not. Take race. Many LWers are willing to entertain ideas about the existence and possible importance of average group differences in psychological traits. So, maybe LWers are racists. But they're racists who continually obsess over optimizing their philanthropic contributions to African charities. So, maybe not racists in a dangerous way?
An overly rosy view, perhaps, and I don't want to deny the reality of the blogger's experience. Clearly, the person is intelligent and attracted to some aspects of LW discourse while turned off by other aspects.