i think it depends on you and the dogs. i have a one yr old german shepherd that just killed 10 of my chickens the other day (it was my fault, i left a gate open). she's a puppy & has poor impulse control & strong prey drive. the two yr old did not engage in the kill. she didn't tear them up, there were no obvious wounds. i think she was playing & it was fun to her.
a few days later, i bought some chicks from a lady that has 8 dogs loose w/ the chickens when she's not home. she said she spends time w/each dog introducing them to the chickens, she holds the chicken & rubs it on the dogs face (with hubby holding dog on leash) & rubs chicken on herself. while she's doing that she's talking to the chicken & the dog. if the dog makes any move or attitude that suggests wrong attention, she sharply slaps her hands together & sharply tells the dog "no-no". she takes the dog (one at a time) into the coop/barn when she goes in to do chicken chores. she praises the dog for good behavior & rebukes the dog for any wrong behavior. she says this conveys to the dog that the chickens are important to her & they are part of the "pack" which is the terms dogs think in. she says this works everytime.
oh, she also said she holds a chicken upside down so it flaps its wings (which can incite a dog). if the dog reacts, she again rebukes it. some of these dogs she's had since puppy, some are rescue dogs & they're all different breeds (mostly pits).