Yes, prednisone can caused increased thirst. The downside is it also leads to increased need to go potty. Tae received a prednisone injection in December for environmental allergies. I had to take her O-U-T every three hours and she had two accidents in the house. I was so relieved once the prednisone was out of her system. The bad news is she's having allergy issues again (can't give her Benadryl b/c she's on Clomicalm) and will probably need another injection this week.
Taebo -- Flashy Fawn Devil, born 12/02/02, adopted 01/10/04