I usually only have 2 of my 3 lurchers off lead together unless we are in a very safe place and I know there isn't anything around they are likely to take off after. Any combination of two is fine, but all three together go a bit OTT and recall goes out of the window.
Both my little terrier x are brilliant and very obedient off lead and tend to ignore the hounds and do their own thing, so I usually walk in shifts and take two hounds and one terrier (one lucky hound gets 2 walks!).
Both my little terrier x are brilliant and very obedient off lead and tend to ignore the hounds and do their own thing, so I usually walk in shifts and take two hounds and one terrier (one lucky hound gets 2 walks!).