The previous information was incorrect, so here is what you can do. minecraft has an enchanting system, and at level 28 of the enchantment table, your pickaxe or shovel will turn into Silk Touch if you enchant at level 28. Go outside, or where grass is, and harvest the grass with the pickaxe - yes, the pickaxe (with silk touch)! This will give you the grass block.
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Grass and cobblestone.
Used a mod or put grass in your house dirt doesn't work so you need to find grass surrounding that dirt you placed and then you need to wait till the dirt goes to grass. Animals only spawn near grass.
You cannot get grass seeds in Minecraft. However if you want to plant some along with some flowers you can use bonemeal on some dirt/grass and it will grow.
You put the dirt in the water, then you make a hoe and use it on the dirt
There are no dogs in Minecraft, although there are wolves. Wolves are found usually in planes or forests. They spawn on grass and dirt.