One should be enough, it it depends entirely on... how they struggle. Remember, we need them relatively intact on the surface to take their hide.

[and he expects that they are going to struggle a lot.

then he straightens up properly, and his tail flicks. he's found a companion for this...! and he could not be happier. (well, he'll be happier when the brand is gone...)]

I need to make a quick stop somewhere for supplies before we set off, if you're willing to wait?