Bleak House was first serialized in 1852. The famous Crystal Palace Dinosaurs were commissioned in 1852 and first shown to the public in 1854. The timing lines up with dinosaurs being something new and exciting to the readers.
Horse blinkers are things that restrict a horse's field of vision to directly in front of it so it's less likely to get startled or distracted. Readers would also have been familiar with them, because they were commonly used with horses pulling carriages.
https://en.wikipedia.org/wiki/Crystal_Palace_Dinosaurs
The collection includes an (inaccurate) model of a Megalosaurus:
https://en.wikipedia.org/wiki/File:2005-03-30_-_London_-_Cry...
Horse blinkers are things that restrict a horse's field of vision to directly in front of it so it's less likely to get startled or distracted. Readers would also have been familiar with them, because they were commonly used with horses pulling carriages.
https://en.wikipedia.org/wiki/Blinkers_(horse_tack)