2- Lethargy, Extreme Fatigue
Dr. Becker says that: “A lethargic dog will appear drowsy, “lazy,” and/or indifferent. She may be slow to respond to sights, sounds and other stimuli in her environment.” And if your dog is lethargic for more than 24 hours then you should take him/her to the vet.
3- Coughing
If it is a one time thing then there is nothing to worry about, otherwise you should take your dog to the vet. Frequent coughing might indicate one of the following: a possible windpipe obstruction, kennel cough, bronchitis, pneumonia, heartworm disease, heart failure, and tumors of the lung.