I'm sorry to hear that your girl is having this issue. Stiff leg and racing heart can indicate several things. First, she may have pinched nerve or disc that causing severe pain. Secondly, this could be a reaction to insect bite or sting (check to see if this is present). Finally, this could be an internal issues (heart, lung , kidney etc) causing this. I would suggest getting her to your vet today as this will need to be seen in person in order to pinpoint the problem. I hope she's doing better soon. -Robyn
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