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My 2-month-old puppy has a sudden, non-painful neck lump. What is it?

Updated On September 23rd, 2025

Pet's info: Dog | Saint Bernard | Male | neutered | 1 month and 21 days old | 85 lbs

I have a 2 month old Saint Bernard puppy who has a huge hard bump on the one side of his neck. It doesn't bother him at all when I touch it and when I move the fur to look it looks like normal skin. It appears within 25-30 minutes because before I was petting him and there was nothing

1 Answer

Most Helpful Answer

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Answered By Lauren Kennedy, DVM

Veterinarian

Published on October 1st, 2017

This lump in your puppy’s skin is probably nothing to worry about. It could be from an insect bite or sting or may be a reaction to a vaccine he had in that area. Keep an eye on it for now. If it becomes larger, painful, or red, then take him to your vet right away. Or if he starts acting lethargic, vomits/has diarrhea or stops wanting to eat, you should take him to be checked out. I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach. Best of luck.

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