Note: I am not sure if this is intended, but it doesn't make any sense to me.
What I expected to happen was:
When sprinting over a line of Anvils, I expected a sprinting sound, as if sprinting over stone.
What happened was:
Sprinting over them (regardless their damage state) will not create a sprinting sound, neither on survival nor creative.
Steps to reproduce:
Build a line of anvils on ground level and add a line of grass, stone etc to compare.
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Confirmed in 13w04a.

Confirmed for 14w17a

It seems the bug is caused by this line: [Client thread/WARN]: Unable to play unknown soundEvent: minecraft:step.anvil

Confirmed for 1.8-pre2, probably due do a sound event that doesn't show up in Sounds.json

Confirmed for 1.8-pre3.

Confirmed for 1.8.

Related to MC-35619.

Confirmed for 1.8.1-pre1/pre2.

Also on 1.8.1 Release

Also there aren't sound when walking on trapdoors.
Fixed somewhere between 15w43a and 15w46a.
Screenshot