
Side effects of prednisone in dogs may include increased thirst and hunger, panting, a loss of energy, vomiting, . There may be periods of time that are better than others but rarely does the disease disappear altogether. Panting, lethargy, or vomiting may also be observed. Dogs If you observe any side effects of steroid use in your dog, do not abruptly stop. Did your vet just prescribe your dog prednisone? So, what does this mean for your dog? What are the possible side effects of prednisone and what should you expect a severe reaction to look like? . Increased and heavy panting; Vomiting; Diarrhea; Fever; Itching; Seizures; Increased thirst; Lethargy.