Go to Black Bone Foreat in Big Valley right below where the Trapper is there's a group of wild boars but also a bush where cougars spawn and try to attack you whether on horseback or foot however it works better on foot just make sure you're able to get on a rock in order to avoid being mauled

Fo you usually have a specific time or no

Usually no but for best results try either morning around 8am or either dawn around 6-8pm it has been known to work mid day as well it just depends if you're traveling downwards from where Proghorn Ranch is located it'll have a higher chance than heading towards

Okay thank you. No cougars yet but I did kill a big ol grizzly

Outside of the occasional Grizzly beware of wolf packs