I have six, almost 7 week old white leghorns (or mix of that) that have been sneezing since I first brought them home. It's hard to tell them apart, but it's at least 3 out of the 6 sneezing. I didn't think much of it as they didn't get any sicker and they are all growing normally. Sometimes I notice a runny nose as well. After looking around, I see this can mean something more serious. What I would like to know is the medication needed and possibly the dosage? They are pets and I will not be getting any more chickens any time soon, so there's no reason to cull them. I just want the sneezing to stop if possible. As far as I can tell their ears are normal. This is my first time with chickens, so sometimes I realize I really have no clue. 
Here's some info on them. I got them from Tractor Supply, raised them in a brooder for 4 weeks and then transfered them to the coop with a heat lamp. The lamp is still in it and on at night since it's still fairly cold. I use non-medicated chick starter/grower (used medicated for the first 5 weeks, with them going out during the day starting at 1 week) and well water. I use pine wood chips in their coop. There's still grass on the ground in the run, so there's nothing covering that. The coop is 8'X4' and the run is 8'X16'. Not sure what else to tell you. Thanks for any help!

Here's some info on them. I got them from Tractor Supply, raised them in a brooder for 4 weeks and then transfered them to the coop with a heat lamp. The lamp is still in it and on at night since it's still fairly cold. I use non-medicated chick starter/grower (used medicated for the first 5 weeks, with them going out during the day starting at 1 week) and well water. I use pine wood chips in their coop. There's still grass on the ground in the run, so there's nothing covering that. The coop is 8'X4' and the run is 8'X16'. Not sure what else to tell you. Thanks for any help!