Thanks for the suggestions, Tikus and CRAusmus. My lighting situation will be variable, as sometimes I will shoot indoors and other times in bright sun or shade - it varies depending on the location of the kennel within the facility. Unfortunately, they don't have an indoor location where I can take all shots. When lighting is better, I will try to shoot without flash, but I won't be the only photographer and all of the other pet photos seem to be taken with at least a little pop of flash. I did some testing with my i40 Nissin (yes - I can use TTL on camera) and have found that the lag time between shutter and flash might be a problem for getting the shot with a hyperactive or fidgety dog. Setting CL will also present an issue sometimes, as the lag between shots just might miss the one I want. CH might be loud and distracting, but the shutter rate just might catch the shot. I will try setting Auto ISO and use noise reduction in PP if necessary.