Anyone seen my sheep ? ~ Jesus

If you find a sheep that is all dirty, bites and swears and is just all around disobedient....it may belong to Jesus. You'll know them by the way that they react when you tell them to follow you back to Christ......
ie...try using something from God's word....that's the ticket.
If they recognize the language that you're speaking to them, and they know that you tell the truth and that you serve the one who IS....they will follow you back to the Shepherd, the overseer and lover of their soul - joyfully. (sometimes, yes, they even skip :))

Just be aware that in some cases, they might continue to bite and squirm, but that doesn't mean that they are not necessarily one of Jesus' sheep. They may have had other people try to pick them up or drag them along back to the shepherd. It is far better for those sheep to just love them and be there with them in the dirt until they see how much the shepherd loves them via your steadfast love.

And He has said to us sheep "Never will I leave you, nor forsake you."

(ahem, note: God's word washes the dirt off, and you'll need to wash after each time being in the "dirt" (world) for any length of time, lather, rinse, and repeat)

Don't pretend that they don't have dirt on them.....but also, certainly don't just pretend to love them either..... Love them as the one who sent you loves you and in that you will show yourself to be truly of the flock of God.

Luke 6:35
"Love your enemies. Do good to them. Lend to them without expecting to be repaid. Then your reward from heaven will be very great, and you will truly be acting as children of the Most High, for he is kind to those who are unthankful and wicked."