Sorry. There's no dogcraft server for PE. As far as I'm aware. Hands up to you though. I use PE at work in quiet times to trial things or test block variations. I tried having a single player world but can't get the knack of it. I can never figure out how to, for example, use a bed. Or other things that you need to interact with. I usually spam tap until I get it. Half the time I break the block before I can interact with it. But good luck. I'm sure there's plenty of friendly servers/realms out there to join up with.