Dogs have been widely used to study the oral absorption of a drug in drug discovery. However, there has been no quantitative validation of using dogs to predict the fraction of oral dose absorbed (Fa) in humans (Fa) for poorly water-soluble drugs. Here, we report the results of using dogs for quantitative Fa prediction, focusing on poorly water-soluble free acid and neutral drugs. The Fa values of 4 acidic and 1 neutral proprietary compounds were measured in humans and dogs. Extensive literature survey was also performed to increase the number of Fa data. Fa and Fa in dogs (Fa) were then compared at equivalent body weight-normalized doses. In the case of neutral compounds, Fa was found to be similar to Fa. In the case of acidic compounds, Fa significantly overestimated Fa in most cases. A difference in intestinal pH was suggested as the main reason for this discrepancy. In conclusion, the use of dogs would not be appropriate to predict Fa for acidic compounds, but more work is required to know about neutral compounds.
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