Thanks everyone.
@gander007 And in the water is just plain water but I have been giving them some hard boiled eggs on the side. There was no apparent reason for the ones death, no marks no where, and it was one of the biggest chicks.
But thanks everyone for the advise.
Also we have learned our lesson with my dog. We keep her away.
Things to think about to add to the water ....
Apple Cider Vinegar I give this to all my poultry about once every couple of weeks and a bottle will last me for several weeks and I have about 60 birds ..
This is some of the birds at feeding time ....
Probiotic , you can get this at any feed store and three packs all hooked together and should last about a week great for chicks and one bag makes one gallon ..... great stuff ....
Save-A-Chick only need to add to water one time as chicks great stuff .....
Electrolyte ,,, Also good stuff again comes in a set of three pack and I use this on my big chickens also .....
Using the egg already good call and dose them a world of wonders .....