It's all good luck of the clover.

If you break grass, which chance that clovers Minecraft Resource Packs will drop from them just like seeds do sometimes.

 The power to these clovers is they have a random item that drops when you place them back again on the floor.

 Most items will be less than common items nevertheless, you may come across really common blocks you will get anywhere.

 But in rare instances you will discover much more valuable blocks. Essentially if you give this to someone else or
 In some full cases there is a chance that
 These can range from Dragon Eggs and Diamond tools/shield to a creeper will spawn instead of an item. full Stone (and other unusual ore) Blocks.But beware with all the clover as it isn't always all the best.

So it's not always good that comes from these to them without them running away.but it might be worth the chance.
 or
The Hungry Animals mod gives pets or animals in Minecraft a more realistic tone. so taming must be employed carefully or by use of traps. You will see a meter when you hover your pointer over an dog and that points out the health, They are simply naturally more worried of you and other folks being hungry, and tamability of these. They'll feed and reproduce on their own also.
Try now  Realistcraft Resource Pack at minecraftio.com/realistcraft-resource-pack/