LaTeXで表のセル内改行はtabularx環境を使うと楽 Jump2Fin4U
\documentclass[10pt]{article}
\usepackage{tabularx}
\begin{document}
\begin{table}[tbp]
\centering
\caption{Fox and Dog}
\label{tab:dox}
\begin{tabularx}{\linewidth}{|X|X|}
The quick brown fox jumps over a lazy dog. The quick brown fox jumps over the lazy dog. & The quick brown dog jumps over a lazy fox. \\
\end{tabularx}
\end{table}
\end{document}