Welcome to pets! I also live in Ontario and am wondering if perhaps she has gotten into some poison ivy? I agree with the temp relief with benadryl but I think you may have to get to a vet for a quick visit. Especially considering you dont know the cause and her entire face is swollen I would be very very concerned, I am sure that is not very comfortable for your pup and would worry what else could happen from such a reaction.
Good Luck and keep us posted.
Tabitha April 10, 1995 - August 23, 2013
Bomber April 10, 1995 - July 12, 2010
Winston Nov 15, 1999 - September 15, 2011
Sophie Aug 30, 2011
"UNTIL ONE HAS LOVED AN ANIMAL, PART OF THEIR SOUL REMAINS UNAWAKENED"
He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion.