Lump on 5-month-old boxer puppy's back: bee sting or vaccine reaction?

Question

I have a 5 month old boxer puppy, and a lump about the size of a quarter appeared on her back yesterday. It looks like it’s right below the skin? It’s hard to get a photo, but I’m not sure what the cause could be of it showing up. She was outside playing a lot yesterday during the day, so I was thinking she might have got stung by a wasp or bee. The only other thing I could think of would be that something happened after she got her last puppy shots on the 1st. Calling our vet in the am. thanks! Pet's info: Dog | Boxer | Female | unspayed | 4 months and 19 days old | 30 lbs

Dr. Strydom, DVM · Accepted Answer

Hello, thank you for using Petco Pet Education Center, formerly Petcoach! It could be any of those things: a localized vaccine reaction, a reaction to her microchip (if she has one), an insect sting.... no way for me to tell you which. Just call your vet to discuss when you can. Take some photos of the lump so that you can maybe send to them so they can decide if you need to bring her in or try some home treatment first.

Lump on 5-month-old boxer puppy's back: bee sting or vaccine reaction?

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