• 02.036 adventures are not all pony-rides

“Pony ride” may be found in OED, but in . no case is it hyphenated.  I’m calling this a JRRT original spelling.

“pony, n.1 and adj.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/147692. Accessed 19 September 2017.