Jabes.plays.RPG says:
OOC: What was the nature of the evil I sensed back at the house we passed? Was it worg or was it something else?
There were no creature types you recognise, you just recall seeing an evil presence in the building. There is no way to tell what kind of evil was lurking.
Everyone gains 85 EXP from defeating the Worg pack - add to character sheet

Ireena leads you and your mounts indoors, and Grizel closes the heavy door onto the swirling mists. You notice that the day has grown unnaturally dark.
The interior of the house is well furnished, although the fixtures show sign of considerable wear. Obvious oddities are the boarded-up windows and the overuse of holy symbols in every room. The stench in the house is horrible.
There is a large opening inside the house. Ireena instructs you to keep your mounts here - any that are left outside will not survive the night in Barvia and so all livestock is led into buildings. "You have horses like Strahd. I know they might prefer to sleep in hay, so I will fetch what I can later. For now, please enter..."
She leads you to the first door on the right of a corridor up ahead. There are four loungers which each could comfortably fit three people each, and four tables, spread to each corner of the room. She beckons you to sit in the south side of the room, and takes the very corner.
"If that is wine, may I drink? I have never tasted the product of another land, from which no doubt you all are from. Perhaps we will need some comfort for the news I must break to you."
She explains to you that the Burgomaster is in a side drawing room — dead. He is lying in a room that is dark, despite the candles burning in his honour.
"I am afraid you are all trapped in our community, from what we have gathered. I don't recall any villager ever entering Barovia from outside, but those who leave are choked by the fog. That is, those who can survive the dogs. They attack the house each night, tearing apart any living flesh that strays outside, with other, terrible, unspeakable creatures. My father could not stand the assault and his heart gave in one night, and no-one of the village has enough steel to help Ismark to bury him. The wolves stopped attacking the very night after father died.
Those dogs outside, though...they are servants of the Count, warped by his magic. We call them 'Worgs'.
I must tell you the truth, one that the villagers cannot take but I am in the hopes that you might. I have been twice bitten by this creature, Strahd, who calls himself Vampyr...he comes here and drains my blood, like I am a goat to be milked. I have been defiled by that evil creature, and what is more, the Holy Symbol has been stolen. It was the one thing the creature was afraid of, and now I have no means of protection other than your timely appearance here. Perhaps you are sent of the Gods to me?".
You say you have a letter from my father - please let me see it? I was not aware that he had sent word outside"