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Hello, I'm Dr. Kara. I have over 20 years of experience as a veterinarian and I'd like to help. Please give me a moment to review your concerns.
I am sorry to hear about Sasha's facial swelling and furry lumps (likely hives) on her sides and legs after heavy exercise.
This sounds like a rare case of angioedema (tissue swelling) and hives precipitated by stress/exercise rather than a true allergic reaction.
While these changes aren't truly harmful the tissue swelling can interfere with breathing and the hives and tissue swelling may be uncomfortable. So we do recommend limiting heavy exercise in dogs that show these symptoms.
Please let me know if you have any further questions.
You are very welcome, my best to your pup. Hopefully limiting strenuous exercise helps.