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\documentclass{article}
\begin{document}
Cats and dogs.%
\newcount\nextfootnote
\nextfootnote=\thefootnote
\advance\nextfootnote by 2
\footnote{Bla bla bla bla bla bla bla. Simplicius, 426:\,32\,sq.\hfill$^{\the\nextfootnote}$\,\box1}
Red and black.\footnotemark
\setbox1=\hbox{pace Ross.}
\end{document}