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When running tcpdump like this

tcpdump -s96 -i eth0 ip -w output_filename

is it possible to tell tcpdump to get the entire packet when a packet is a DNS request/response?

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Unfortunately, no.

The underlying BPF engine could do it on some platforms, but the filter language that compiles to BPF code doesn't support that (and it would take either a change to the filter language, or a change to the tcpdump command-line syntax to support multiple filters and -s flags, to support that, as well as significant changes to the BPF compiler, so that's not likely to happen soon).

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