Most little puppies nip and bite by nature! Don't worry, your dog isn't aggressive or bad, he's just a baby who needs to learn what's acceptable and what's not. My pom is 4 months old now, and he nipped when I first got him too.
What my trainer told me (which reflected advice I'd seen online) is that when he bites you, immediately say "ow!" in a loud/sharp tone as you remove your hand (not so loud that you're terrifying him or screaming at him, you just want to startle him enough that he realizes something's changed), and turn your back to him/stop playing and interacting with him. If you were playing with him with a toy, remove the toy as well. After 15-20 seconds, you can go back to playing.
Repeat as necessary, and if he's not getting the idea and keeps nipping, let him have a break in his crate or pen and try again later (while he's in there, try giving him a chew stick or puppy nylabone–it's possible his teeth are hurting him). The idea behind all this is that puppies learn from their littermates when they're playing too rough–the other puppy will yelp and stop playing, and soon a young dog starts to understand that biting too hard=the fun stops and I get ignored. Since he's not around other dogs, you have to be the one to teach him that biting isn't okay.
My puppy stopped trying to nip and gnaw my fingers pretty quickly after I started using the "yelp and ignore" method (lol)...they're smart little dogs, and if you're consistent and patient with them, they'll surprise you with how quickly they can learn. Make sure other family members also comply with this and don't let him nip and gnaw their fingers–some people seem to find this behavior cute, but you definitely don't want it to continue, and getting everyone on board with your training plan will keep your puppy from getting confused about what's okay and what's not. I know different things work for different people, but I personally wouldn't recommend "punishing" him or doing anything too harsh to correct him (like getting physical with him or spraying him)–he's a tiny baby and he's not being "bad," he's just doing what all puppies do and he simply needs to learn the correct way to act.
Reminding myself that my little puppy is just a tiny baby who needs patience and understanding really helped me get through some of the more challenging moments of his first month with me. A lot of advice out there is all about dominance and showing your dog who's boss, and I feel like it can create this adversarial mindset where every time a dog does something we don't want them to, we think it's because they're trying to be in charge or establish dominance, and sometimes it's just because they really don't know any better yet, or they're confused about what's okay.... If you're really not having success, consider hiring a trainer. Even one private session can help SO much.
It might seem silly or excessive, but I did it with my puppy and I'm so glad I did. Puppies are adorable but they can also drive you crazy and really try your patience, and having someone there who's seen it all a million times and knows exactly how to help can be so reassuring. Once your puppy has his shots, you might also consider bringing him to a doggie play group or daycare–being around other dogs from a young age will teach him important socialization skills and manners, help him burn off energy, and set him up to be less fearful/territorial around other dogs as he grows up.
Good luck with your puppy!
This is very bad and you need to do something about it immediately. When he bites, make eye contact, say NO and jerk your hand away. Stretch out your hand again, repeat, and gently pull the scruff of his neck if he bites the second time.
When he starts licking rather than biting, stroke him and tell him he's a good dog.
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