/usr/lib/x86_64-linux-gnu/libdogleg.so is in libdogleg-dev 0.09-2build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libdogleg.so.2.0.9
/usr/lib/x86_64-linux-gnu/libdogleg.so.2.0.9