Deworming
 

My puppy is 12 weeks old and I didn't deworm yet as I don't know about it.So will it harm my puppy.


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I suggest you check with your vet. If you puppy is due for a checkup or shots, you can ask then and also take in a poop sample,about a teaspoon - I use a plastic spoon and put the spoon with the poop on in a freezer baggie.

I think you need to do fecal tests to find out what worms the puppy has to decide which dewormer to use. Dewormers are specific to types of worms, so you need to pick the right dewormer for what your pup has -- ask the vet.

ETA: failing to deworm can be very harmful if your pup has worms, depending on the type of worm --but you don't know at this point whether the pup even has worms.