Cerebrospinal Fluid PressureIntracranial PressureCerebrospinal FluidCerebrospinal Fluid ShuntsIntracranial HypotensionExtracellular FluidPressureHeadacheSkullIntraocular PressureDogsIsofluraneHydrostatic PressureBlood PressureCerebrospinal Fluid ProteinsTransducers, PressureExtracellular SpaceFossilsHominidaePaleodontology