How often, and for how long are your dogs out? Do you go out with them?
I would teach a "quiet" command. When the dog barks, stick a treat under her nose. She will stop barking in order to sniff the treat. Say "good quiet!" and give the treat. The idea is that you gradually start requiring longer "quiet" times before she gets the treat. The first time, the treat under her nose will be enough to make her stop, at least for a second, and you give her the treat to reward her being "quiet". Gradually, she has to stay quiet for, maybe 3 seconds, then the next time, maybe 5 seconds, then after awhile, maybe 20 seconds. It should all go gradually.
If she doesn't respond to the "quiet" command then she immediately goes back inside, until she's quiet. Then, you can let her back out. If she barks again and doesn't respond to "quiet", it's back in again. The hard part is putting her inside every time she barks and doesn't respond. But, being consistent is super important.
Also, I would go to the fence to see what they're barking at (even though you already know), and say something like "ok, thanks, I'll take it from here." I know it seems silly, but, someone recommended that for us years ago on Dog Forums, and it actually worked. Dogs often think it's their job to let you know someone or something is near your property or area, and if you let them know you got their alert, and will take over, they will often go about their business.
I would teach a "quiet" command. When the dog barks, stick a treat under her nose. She will stop barking in order to sniff the treat. Say "good quiet!" and give the treat. The idea is that you gradually start requiring longer "quiet" times before she gets the treat. The first time, the treat under her nose will be enough to make her stop, at least for a second, and you give her the treat to reward her being "quiet". Gradually, she has to stay quiet for, maybe 3 seconds, then the next time, maybe 5 seconds, then after awhile, maybe 20 seconds. It should all go gradually.
If she doesn't respond to the "quiet" command then she immediately goes back inside, until she's quiet. Then, you can let her back out. If she barks again and doesn't respond to "quiet", it's back in again. The hard part is putting her inside every time she barks and doesn't respond. But, being consistent is super important.
Also, I would go to the fence to see what they're barking at (even though you already know), and say something like "ok, thanks, I'll take it from here." I know it seems silly, but, someone recommended that for us years ago on Dog Forums, and it actually worked. Dogs often think it's their job to let you know someone or something is near your property or area, and if you let them know you got their alert, and will take over, they will often go about their business.