I agree with everything that's been said and maybe knowing you're not alone helps a little? We've probably all felt a little overwhelmed when our babies were puppies. They can be a big handfull sometimes. Make sure he has things he likes to chew on and when he's biting redirect him to those things. It gets easier- I promise!
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226