If your concern is flies and flystrike, which your comment about crovect implies, you could use one of the fly repellents. I’ve used Naff Off before, others talk about Barrier Blowfly Repel etc. If they’re very tame and placid you might dag them, but not if you think they would be stressed by it, or if they would need restraining in a way which might press on their bellies.
The red fly traps work really well too.