Coyotes will hunt at any time. I had one take a broody mamma hen 10' away from the house in my driveway at 6:00 p.m (doesn't get dark here until after 9:00 this time of year. They are very bold this time of year and as another poster said, you should keep close watch on your dog as well as your chooks. At only 15 lbs he's very vulnerable to attack.
A couple of years ago the coyotes were very bad here and running in packs, my 75+ lb lab mix ran into 6-8 of them in the lower field. Fortunately she showed a bit of sense (for the first time in her life) and ran right thru the pack and back to the house. She usually chases coyotes out of the area, but that many could have done real damage, even to a dog her size.
Coyotes will dig under and/or climb most fences, I'd suggest keeping your chooks in a run for now and reinforcing it with a few strands of electric fencing.
A couple of years ago the coyotes were very bad here and running in packs, my 75+ lb lab mix ran into 6-8 of them in the lower field. Fortunately she showed a bit of sense (for the first time in her life) and ran right thru the pack and back to the house. She usually chases coyotes out of the area, but that many could have done real damage, even to a dog her size.
Coyotes will dig under and/or climb most fences, I'd suggest keeping your chooks in a run for now and reinforcing it with a few strands of electric fencing.