Earlier studies on sweet taste in cats and dogs reported that in contrast to cats, dogs prefer natural sugars, e.g., sucrose, glucose, fructose, and lactose, but not maltose (17-19). Dogs also show a preference for sodium cyclamate, but not for sodium saccharin (17,20) These comparative behavioral data are consistent with data generated from electrophysiological studies. Boudreau classified part of the cat taste system into several group units (I, II, IIIA, and IIIB). These cat units have their counterparts in the taste system of dogs (class B, A, C, and D units). Unlike cat group II units, dog class A units respond to sucrose and fructose (5). By recording from the chorda tympani nerve, Beidler found that cats do not respond to 0.5 mol/L sucrose, whereas dogs do (11). Anderson et al. (21) showed that taste nerve fibers responding to strychnine in dogs also respond to saccharin, which implies that dogs find saccharin aversive. Overall, cats and dogs respond very differently to sweet-tasting stimuli, although both species belong to Order Carnivora.
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