Disappearing Dogs in Minecraft

I have a creative world where I build/test redstone inventions and I have 4 dogs or tamed wolves the name of the three dogs are Altair, Ezio and Connor and the other one doesn't have a name. When Iogged in now I saw that only Ezio is there and his not tamed (I tamed him) and his sitting and attacking sheeps in my wool farm, I didnt see the other 3 dogs and I have to tame Ezio to make him my pet again and he seems not teleporting to me.