Free: Contests & Raffles.
Not sure I would want my dog in a kennel mounted to the boat. If something happens and the boat rolls over or sinks...the dog is gone and maybe you too trying to get her free.
You could always add seat heaters to the boat.
Forget about putting another thing in your boat like a kennel. If your boat is anything like mine or most duck hunters you already have too much gear in there. Lol! What I’ve found works just about better than anything is to keep the dog #1, out of the water when not fetching, and then #2 bring along a automotive chamois or Absorber (kinda a mix between a chamois and a sponge) to wipe the dog down real good once they get out of the water. It usually doesn’t take very long to do this, and I’ve noticed my dogs stop shivering pretty quick once you get them towels down. I usually try to do this once the water starts to get near the freezing mark, and rarely need to above that. I’ve seen video from a lot of dog trainers that say this is the best thing for them and I have to agree. The quicker you get the water back off, the faster they warm. Anyways, just my 2 cents. Good luck!