My dog Jake

My Jake is very smart dog. It is a German Shepherd dog. Jake has nice and black fur. Jake can give his hand and sit. I love my dog.

[Good.  Since 'German Shepherd' is known to be a type of dog, 'German Shepherd dog' is redundant.]

My Dog Jake

My dog Jake is very smart. (dog.) He (It) is an (a) Alsatian. (germany shepherd dog.) Jake has (have) a nice (and) black coat. (wool.)  and will (Jake may be) give you a paw (hand) and sit. I love my dog.

The breed is commonly known as an 'alsatian'. As the name is Jake, I presume it is a male dog so you can refer to as 'he' to save using 'Jake' all the time. You need to say 'has' as this is singular - 'have' if talking about several dogs or dogs in general. We refer to the dog's 'coat' and when they give you their hand, we say they 'give you a paw'. I'm sure he is a very pleasant and obedient dog.

My dog Jake

My Jake is a very smart dog. It is a Germany Shepherd dog. Jake has nice and black fur. Jake may be will give me his paw hand and sit. I love my dog.

My Dog Jake

My Jake is a very smart dog. It is a Germany shepherd dog. Jake have has a nice and black coat of hair/fur wool. [Wool are long hair from sheep, etc.  You don't call the hair of chinchilas or minks wool either.  They are known as furs, higher class stuff] Jake may be give hand and sit. He knows your hand gestures for him to sit. I love my dog.