I bought the citronella collars for both of my girls and even though they were the smallest size they were still to bulky for them, I sent them back. I just today received a bark control device that has worked very quickly. I got it from Dr's foster and smith
PetSafe Stationary Bark Control Device PBC-1000 Kennel Vet
One price and its useful for all the dogs which I like, and if you want to manually trigger it you can as well.