Dog's neoprene vest.

Dog's neoprene vest is a must, especially during cold weather, when waiting for the birds in a duck blind or in a boat.
The main benefit is, that the dog stays warm and this is especially important when it is cold weather. Other benefits are protection against snags, sticks, sharp vegetation and so on.

Good fit is crucial

The vest doesn't hinder dog's movement in any significant way and the vest sits better after some use. I have cut the vest around the dog's genitals for more comfortable fit. I sew the seam to be sure, that the vest doesn't fall apart.

When you choose the right vest, pay attention, that it is enough tight. It is supposed to sit like wetsuits. Too loose vest looses some of it's efficiency.