I applaud your decision to make the shelters your first choice. In general, I would advice that you look for breeds or mixes with herding and livestock instinct and avoid the hunting breeds, which have prey instinct. It's not a sure thing either way, but it increases the odds of you finding a dog that works for you. When the time comes for my family to get a dog, I'm going to do some research on Corgis to see if they'd make a good compact but protective breed.
Either way, you're better off getting a puppy and raising that puppy in contact with chickens. You'll still need to provide adequate training, and keep a close eye on them at first, but they're more likely to associate chickens as members of the family instead of squeaky toys that way. There's a really interesting thread here on the forums about a lady who raised a puppy with chicks, and how she did it, it may be super useful to you. I'll see if I can dig it up if you are interested.
It takes time to train a dog to be trustworthy around chickens, unless you're super lucky and have a natural. For right now, I know it takes more time than I personally have because I work full time. I may be able to reduce my hours this summer and spend more time at home with the animals... I'm crossing my fingers. Let us know how it goes!
Either way, you're better off getting a puppy and raising that puppy in contact with chickens. You'll still need to provide adequate training, and keep a close eye on them at first, but they're more likely to associate chickens as members of the family instead of squeaky toys that way. There's a really interesting thread here on the forums about a lady who raised a puppy with chicks, and how she did it, it may be super useful to you. I'll see if I can dig it up if you are interested.
It takes time to train a dog to be trustworthy around chickens, unless you're super lucky and have a natural. For right now, I know it takes more time than I personally have because I work full time. I may be able to reduce my hours this summer and spend more time at home with the animals... I'm crossing my fingers. Let us know how it goes!