Lab seems to be breathing heavily gums gone dark?

Hello

My lab seems to get out of breath quicker when running with her tongue out more. I am sure her gums used to be pink but are dark now. She is in good health/weight. It says online this could be an oxygen /heart problem. Has anyone got any ideas? I'm new so thank you and she will be going to the vet tomorrow.

 

Welcome to the forum.
This sounds worrying. I would talk to your vet ASAP.
Jac

 

That's worrying, I would ring your vet now for advice or an emergency appointment. Let us know how she gets on. xx

 

Fingers crossed you get some answers from your vet.

 

Any news on this? Wondering if it's heart because I have a lab with a serious heart defect. Keeping my fingers crossed that it's nothing serious.