I'll be hunting a 5 year old Vizsla this year. She is in great shape as I exercise her often. The winters here average in the mid 40s. I have had her out for 2 hours working planted birds with no problem. Will be hunting wild birds this year. Am wondering how many hours per day I can work her without over extending her abilities? I'm sure there are a lot of variables such as weather conditions, diet etc that are considered in this answer. I have hunted with other dog owners who rotate their dogs every couple of hours. Unfortunately I only have one. She is my first bird dog so the learning curve for me is steep but loads of fun. I would like to have a dog that can work for 4 hours. Can a Vizsla handle 4 hours? What other breeds should I be looking at for my next dog? Thanks for your experiences.