Wheezing after exercise

[Taylor_B]

Posting on behalf of my brother who doesn't have an account:
He has a one-year-old female lab who is otherwise healthy; typical lab pup: endless energy; bouncing off the walls with excitement.
He's noticed though that after bouts of exercise (especially playing fetch with her tennis ball): After just a few throws, she's wheezing and panting very heavily. She just lays down, wheezes, and pants very fast. This happens as soon as 5 or 7 throws.
For as young and fit as she is, he's worried about it.
She seems to do ok on trips to the field and long walks - even seems ok running around and playing with other pups.
I'm not sure if she could just be REALLY exerting herself when they're playing fetch?
Or if there could be a real issue here? (heart issues, namely)

He's got a vet appointment, but curious in the meantime.
Thoughts?

[PoorMansWrangler]

When my GSP did this, it was kennel cough. It sounds like a duck when they are wheezing. Mine was vaccinated, but since kennel cough is like the common cold for dog, their are many strains and the vaccine may not cover it

[ezzy333]

Kennel cough is a disease that will last 2 weeks if you treat it and 14 days if you ignore it. Make up your mind what you need to do.

[zrp]

This doesn't sound like kennel cough to me. I'd keep the appointment

[Steve007]

This doesn't sound like kennel cough to me. I'd keep the appointment

For sure. I'd be concerned about a cardiology problem. But the OP's brother definitely needs more information.

[Fun dog]

First thing that comes to mind is a heart problem.