also, only use a little of bluing, if you use too much you might turn your white animal blue. just a little bit, to remove yellowing and brighten white.
I don't have any particular brand, I usually borrowed some from the vet clinic when they had a small grooming station. There isn't a huge variety of selection where I live so I just made sure it was animal safe. Old women also buy bluing to prevent yellowing of their silver hair, or white dogs...
bluing is the shampoo to use for brightening whites, both fur, hair, and feathers. We end up using a dog shampoo with permethrin to clear out lice and keep them off for a little while, a lot of shows will reject you for lice. I follow that up with some permethrin based dust or spray once a week...