What breed is this?
Wht is the heart rate?
Any other symptoms? Breathing okay? Eating, drinking?
Normal heart rate for a dog thirty pounds or over is 60 to 120 beats per minute
If this is over that rate call your vet.
Respiratory rates are 10 to 30 breaths per minute, if the dog is panting it can be up to 200 pants per minute.
I am directing you to a site to explain this and how to take the pulse rate, please try to get a count on the dog.