I have two dogs- an 8-year-old female border collie and 2-year-old male kelpie x border collie. Our neighbor has complained a couple of times that the younger one is barking incessantly all day and the older dog joining in on occasions. They hardly ever bark when we are home. My partner thought perhaps she was exaggerating however I have confirmed with another neighbour that there is some noise happening though apparently not constant. Of course the first thought would be boredom with working dogs however they do get a fair amount of exercise- 20 minute free run in the morning and 45 minute walk in the evening. We have a slatted fence at the side of house which gives the dogs a view of the street and I'm thinking of putting a solid fence to reduce stimuli from outside. Thoughts? I'm not sure if it's territorial barking, boredom barking or separation anxiety barking which makes it a little difficult to know what to do particularly as by its very nature you can't catch him doing it! He's not overly interested in playing with toys alone, we try leaving bones and other treats but the older dog is very dominant and tends to steal them all. Our neighbor is a dog owner too and keeps suggesting a citronella collar. I really don't believe in them as you're punishing natural behavior and not differentiating between causes however I'm thinking of getting one if only to appease our neighbour and demonstrate we are trying! Thoughts would be appreciated.