What happens when a Chimera and a Pack of Dogs cross roads?
Well Silvally is the Chimera and the Zygarde Dogs are the Pack. Perhaps they're all on the same team, perhaps the Silvally wandered into the fairly empty grasslands in the middle of the night while his Human Trainer is asleep.
Whatever the case maybe, they're fucking. Cease your overthinking and just enjoy the time. They're certainly enjoying the time.

First time posting here. Also first time I've posted publicly too.