[header] How to diagnose canine infectious hepatitis [title] Be aware of the signs of infection. [step] The first sign is a fever of 104f (40c) or over, which lasts for 1-6 days. The dog may also have sticky eyes, which is a very similar presentation to distemper. 
Dogs with ich usually become very ill very quickly and are extremely lethargic and lacking in energy, off their food, develop sickness and diarrhea, and then a raft of other symptoms. This varies slightly from distemper, where the symptoms tend to come on less quickly.