
Sorry to hear you didn't manage to register today.
As to steroids, yes there are side effects but speaking from my experience using them on Rosebud, all I did see was as your vet said increased thirst and appetite.
When Rosebud was a young bitch of about 14 months she got a chronic infection and nearly died. She was given steroids and was on a much higher doseage than you are giving Poppy. Your vet will be aware of the side effects and I am sure will advise you accordingly.
Polly