Raising a dog vs a kid

I currently have a 5 year old who is waaaaaaaaay easier to raise and take care of than a damn dog!!! 
My husband brought home a puppy a few months back who is now 6 months old and HUGE! He is destroying our house!! He is chewing on the corners of walls, as ripped the baseboards up and chew them into a million pieces. He keeps trying to bite my cat and have even trying nipping at me several times. 
I hate having a dog! Why is this so hard?!? 😩 
Any tips on training?!? I give him treats when he is good and yell when he is bad. I don't like to hit and I don't use his kennel as a punishment seeing how he has to spend time in it each day when we are at work 😕

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