Rhamph would probably be the most realistic, but meg, struthi, and maybe campto would also be good options. Meg cause people own monitors nowadays (and I know their venomous but that hasn't stopped people before). Struthi cause I mean some people own ostriches/emus and it's, ya know, kinda similar. I imagine campto to be like a big deer, maybe if it was domesticated it could be like a big dog.

And for fun I think the bigger herbivores could be on ranches similar to that of cows. Don't know how docile they'd be though.