Are they really necessary? My breeder sent home a sample of Nu Vet tablets. I haven't used them even though she' pretty adamant that I keep Gunner on them for his whole life. I feel like I feed him better foods than she did (she sent him home on Eukanuba). Now I'm delving into even better quality foods (premade raws). So I'm just wondering what everyone else does. Anyone use vitamins? Feel the are necessary? What brand do you use?