 Furthermore, while the appeal to similarity is very natural, it can be hard to spell out in detail since the intuitive sense in which, say, my wife and I “share most of our beliefs and inferences” seems to presuppose just the sort of content identity that meaning holism makes problematic. One would like to say that I mean something similar to my wife by “cat” because, in spite of our differences, we both believe things like “cats make good pets”, “cats are mammals”, “cats are typically smaller than dogs”, etc. However, to say that we “share” these beliefs would be to assume that we mean the same thing by “pet”, “mammal” and “dog”, which is something that the meaning holist is committed to denying. Strictly speaking, for the meaning holist, I don’t share any beliefs and inferences with my compatriots and past selves, and so similarity can’t be explained in terms of shared beliefs and inferences (Fodor 1998; Fodor and Lepore 1992, 1999). 