PetPlus enables the possibility to have pets in MCPE. This is quite similar to what you can find in the PC version of Minecraft where you can tame wolves and keep them as your pets. PetPlus lets you tame pretty much any animal, feed them and become their very best friend. In total you can have 7 pets and each of them got their own personalities. If you set your home in MCPE somewhere you can have your pets go there automatically.
It is at this point a rather simple mod but it adds many fun elements to the game and especially so if you are used to running around alone in the world of Minecraft.