Petco Text Logo
Petco Pet Logo

  • Two Easy Ways to Start Earning Rewards!

My puppy has a sudden red lump under his leg. What should I do?

Updated On September 23rd, 2025

Pet's info: Dog | Labrador Retriever | Male | unneutered | 3 months and 12 days old | 34 lbs

My 4 month old Chocolate Labrador Mix has a irritated red lump under his front left leg that appeared out of nowhere. i know for sure it wasn’t there as of this morning then we me and my fiancé got home it was just there.

This question includes photos that may contain sensitive content. Click to view.

View more to consider that the photos may include sensitive content.

2 Answers

Most Helpful Answer

Image profile

Answered By David Elbeze, DVM, MRCVS

Veterinarian

Published on August 15th, 2018

This is probably an allergic reaction due to an insect bite or a plant outside. those reactions tend to resolve within 48 hours without treatment. if the swelling becomes too large or if your dog is lethargic, take him to the vet in order to get an antihistamine injection.

Vote icon

1Pet Parents found this answer helpful

Other Answers

  • Image profile

    Answered By Ricardo Fernandez, DVM

    Veterinarian, Veterinary Oncology Resident

    Published on

    Thanks for using Petco Pet Education Center, formerly Petcoach! This is likely an area of irritation or inflammation though it is hard to know for sure without an examination. You may continue to monitor him for now. However, if this worsens or just does not resolve, have him evaluated by a veterinarian for further assessment as other things like an infection cannot be ruled out. Good luck and have a good night!

    Vote icon

    0Pet Parents found this answer helpful

See More Answers

Related Questions

Petco Pet Education Center
Health & Wellbeing
What fish dog food helps dry skin if my dog eats Science Diet?
Is your dog's dry skin a concern? A certified vet offers expert advice on finding the best fish-based dog food alternatives to Science Diet for essential oils.
Updated on February 04, 2026
Petco Pet Education Center
Health & Wellbeing
My guinea pig has a growing lump on its neck. Can it heal itself?
Guinea pig has a growing, hard neck lump? Worried about vet costs? A certified veterinarian advises on crucial steps for diagnosis and your pet's well-being.
Updated on December 04, 2025
Petco Pet Education Center
Health & Wellbeing
My pet has a lump on their neck. What is it and what should I do?
Is your pet's lump a mystery? A licensed vet tech explains common causes like tumors or infections. Discover why a vet visit is crucial for diagnosis and treatment.
Updated on December 04, 2025
Petco Pet Education Center
Health & Wellbeing
My pet has worsening sores and scratches. Could it be an infection?
Nike's worsening sores and constant scratching worry his owner. A certified Petco veterinarian offers expert guidance on potential causes like bacterial infections and next steps.
Updated on December 04, 2025
Petco Pet Education Center
Health & Wellbeing
My mouse has a growing lump. What can I do if I can't afford a vet?
Concerned about your mouse's growing lump and vet costs? A trusted Petco veterinarian provides guidance on managing her comfort during this difficult time.
Updated on December 04, 2025
Petco Pet Education Center
Health & Wellbeing
My pet has a soft lump. How long can I wait before seeing a vet?
Discovered a soft, nickel-sized lump on your pet's chest? A certified veterinarian offers expert advice on tracking changes and when to seek professional evaluation.
Updated on December 04, 2025
image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Book Now

Sponsored