Seems to be unused: I didn't see any code related to Hunting Ground or dogs that checks landparam.
Could leak into other lands: for example, with ./hyper -C -W Hunting -W2 Minefield -I Turquoise 1, some dogs that generate on Minefield cells would also incorrectly mark their Minefield cell as "known mine".
./hyper -C -W Hunting -W2 Minefield -I Turquoise 1
, some dogs that generate on Minefield cells would also incorrectly mark their Minefield cell as "known mine".