Could be many causes and treatment will depend on which one. If its post runs it could be kennel cough, exercised induced bronchospasm or even heart failure to mention just three. A little more detail may help or vet if not sure. I’ve done a piece on EIB that I’ve copied below and I’ve posted on kennel cough on this forum linked below. Eating grass probably has a number of causes, it’s a good source nutrients in the spring when young and is likely a way to settle a stomach when upset. Dogs can'