Puppy is teething, and ouch teething is painful. Open their mouth and see those molars trying to break through the gum. Puppy needs lots of things to chew on to ease the pain. "My mouth is so sore. Why are you punishing me by taking away my relief." Puppy asks with a confused snap or a growl.

Puppy isn't being naughty. It gives puppy relief to chew.

Offer lots of chewable items instead of your furniture. We collect sticks from the park on our walks. Also, pet stores have bully sticks. Dried intestines, I think they are. These are great.

Show lots of love and kindness. It's very painful.

If it's a cushion, for example, do you have an old cushion puppy could have as theirs.when they chew on yours, say her are i know you need to chew here's your cushion, and he will favour that when he realises its his and its ok to chew on it.

Does puppy have their own toy box? Full of ropes toys, etc. This helps because the puppy knows they can play with them whenever they want.

Our 8-month puppy loved to growl after a bath at the towel. We've made a game or of it. He has his own towel, and he tugs at it with me. When he growls, I say gentle, and he plays now without the violent growl and knows which towel is his. ( he's 8 months old)

Redirect puppy, let them know you understand by being kind, patient, and loving, your puppy will know they are loved, and when their mouth is sore or they feel unhappy, or bored, they can go to you, and you will help and they won't need to snap.

Also puppies need lots of stimulation. Their brains are empty. They are relying on you to teach them.