[LaTeXで表のセル内改行はtabularx環境を使うと楽 Jump2Fin4U](https://tgnx8810.wordpress.com/2014/11/29/latex%E3%81%A7%E8%A1%A8%E3%81%AE%E3%82%BB%E3%83%AB%E5%86%85%E6%94%B9%E8%A1%8C%E3%81%AFtabularx%E7%92%B0%E5%A2%83%E3%82%92%E4%BD%BF%E3%81%86%E3%81%A8%E6%A5%BD/)
\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}