From the latest position statement of American Veterinary Society of Animal Behavior:
Evidence supports the use of reward based methods for all canine training. AVSAB promotes interactions with animals based on compassion, respect, and scientific evidence. Based on these factors, reward-based learning offers the most advantages and least harm to the learner’s welfare. Research supports the efficacy of reward-based training to address unwanted and challenging behaviors. There is no evidence that aversive training is necessary for dog training or behavior modification.
Read the entire statement here.