Accepted Answer

It's good news that the swelling hasn't gotten any worse. But I agree that the hoarseness could be something to worry about. The concern there is that if she is continuing to swell up, even if it's too small an increase to be immediately obvious, or if the swelling is more internal than external, there is always the risk that her throat can swell shut and she will be unable to breathe at all.
My best recommendation would be to have her seen by a vet who can actually evaluate her condition and give her some medications to decrease the swelling immediately and quickly. The vet would also be able to confirm that it is just soft tissue swelling, such as from an allergic reaction to an insect bite or sting, rather than something else - such as an abscess from an injury that might have occured before you ever got her. (Abscesses can sometimes take a week or more to develop.)
If getting her into a vet tonight is not an option, you can try giving her some over the counter anti-histamine, but would definitely need to watch her very closely tonight and be prepared for a very rushed trip in to an emergency vet if she does start having problems breathing. But if that is the only option, let me know so I can determine what an appropriated dose for her would be - with such a young pup, not to mention such a small breed, the risk of overdosing is a major concern.

Dr. Z

PS - I just saw where you already gave her Benadryl. How much does she weigh? And what is the concentration of the Benadryl that you gave her (mgs/ml)?

Edited by Dr. Z on 8/11/2008 at 12:54 AM

Expert:	Dr. Z
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Accepts:
Answered:	8/11/2008

Veterinarian

12 yrs as small animal vet; 20+ yrs in animal care; interests incl: breeding, skin probs, training