https://itunes.apple.com/hk/app/cardalis/id569166179?mt=8



This was sent to me earlier today, it might help.

If you have a dog with or at risk from heart failure, your veterinary surgeon may ask you to monitor this over time.
This app will help you to measure your dog’s breathing rate, record it as a graph. This results graph can be e-mailed to your veterinary surgeon.