Hi there,
just as flemma has said I have always used people shampoo, followed by people conditioner and have never seen any bad effects, just so long as you rinse thoroughly, I too don't bath my dogs as a matter of course, They need the oils in their coats, but sometimes needs must as they say, and our little darlings love stinky things!! I had a dog that fell in a slurry pit once! boy did he stink, I was bathing him every day for a week and ever after he hated the water, bless him, good luck bathing your dog, remember to put a rubber mat in the bath or a towel so that he doesn't slip.