Watertown Fire Rescue crews were called out early this morning December 5th ,2021, shortly before 4 am for a fully involved structure fire. The fire was at 125 10th Ave NW, on arrival crews found a 2 story detached 120 year old barn, on the property, fully engulfed in flames. Initial flames were 25-30 foot high causing the trees overhead to start on fire. The barn and trees were causing burning embers and branches to fall on an adjacent home and into the street. The adjacent home was occupied and WPD officers helped that family evacuated for safety reasons. Fire crews attacked both the barn fire and also used water to protect the adjacent home from the burning embers. Within 10 minutes of arrival fire crews had the fire knocked down but heavy smoked remained in the area. Crews spent the next 3 1/2 hours overhauling the barn and putting hot spots out. The barn was used to house 4 dogs, 1 dog was able to escape but the other 3 are believed to have died in the fire. There was fire damage to the adjacent home owners vinyl fence and reports of light smoke damage to the adjacent home owners house, the family was allowed back into their home. The barn and its contents were a total loss. Crews remained on scene for just over 4 hours.