The Tiger 800 has nothing to protect the rear suspension unit.
However, Puig has a combi chain guard/hugger that works very well.
Part no. is "puig-6040", and is suitable for: Tiger 800 / XC 2011-2018, Tiger 800 XCX / XCA / XR / XRX / XRT 2015-2018.
See here for more info:
https://pyramid-plastics.co.uk/products/triumph-tiger-800-xr-xrt-xrx-low-hugger-matte-black-2012.
With the Tiger 800 now sold, it is up for sale.
(It was pretty grubby, especially with old chain lube, but has been cleaned thoroughly.)
I would like £59.50, which includes P&P to mainland UK.
