If Patience is barking at four wheelers and other things beside the horses then I doubt it is a prey instinct kicking in. Again I would suggest the barking on command solution. You can work with Patience a few times a day for approximately 10 - 15 minutes at a time. Have atleast 3 training sessions a day if possible. You should start to see results in 4 to 5 days if your consistent.

The hardest part of this is getting the dog to bark when you want them too. I use the speak command and have a food lure present. I actually speak at them too until they catch on to what I am asking of them. The second they bark then they get the reward. Repetition is the key after they get the hang of it. Gradually you lose the lure.

Once they learn to speak on command then you can implement the SHUSH command. If they speak for the reward when presented with it (which most dogs do automatically) then give them a SHUSH and again as soon as they stop barking give the reward.

I have trained with choke chains and without. I prefer the without methods now since my dogs seem more willing to cooperate with me for a reward than for a punishment.

Just a friendly little side note: It all comes down to what you are comfortable with and what you think your dog will respond too. Both methods (choke or reward) can work. If you do use the choke method then make sure you implement it the correct way. Have the choke chain high up on the dogs neck (just slightly below the bottom of the ear) and keep it from sliding down to the lower part of the neck. There are pressure points higher up that get the message across faster to the dog. Lower in the neck and you can effect the throat. When you do give the correction make sure it is quick and forceful with the verbal command to reinforce it. Slow and lasting chokes are not effective.

Again though (I'm sorry to keep repeating this but...) I recommend the reward method. You can't go wrong giving the dog something they need to survive anyway.....FOOD! It works for even the most stubborn of dogs!