You will make a great decision in giving a dog a second chance and you can help ease the transition from nervous dog to pack leader!
Fortunately, there are a lot of rescue teams that are working hard to save such animals and try to provide them a better environment to live in. A lot of countries have laws against dog abuse but they are effective only in few places. Dog abuse and puppy abuse along with abuses on other animals need to be taken more seriously and dealt with severely.
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