Help fund specialist searching equipment

Hi Don, our 5-month old labrador and our 12-month collie decided to go walkabout yesterday morning and left our farm. After a long search, our collie returned home at 2230 last night without the puppy. We have searched our farm, the neighbours 300 acre farm and the next one to that. All in an ATV stopping and calling on the way. Obviously the weather was shocking and we have a river that flooded. Very worried about her right now. Do you have any thoughts or advice. Many thanks, Rob & Jo Barnes, Rural Wellsford