Working Dogs & Their Behavior
First of all, notice that I did not specify breeds in the title. There's a reason for this, friends, and that is because going into breed details is going to get overwhelming rapidly. If you need help with a specific breed, go ahead and ask so I can give you the deets.
Dogs who have been purpose-bred for utility. They have been genetically selected for generations to create a dog who knows what their job is from the time they open their eyes and meet the world.
These are the collies, the shepherds, the corgis, etc. who all have similar behavioral patterns regardless of their upbringing.
These guys may have what we in the dog world call drive. They have a deeply-rooted need to perform their job and to do it well and if you have an extremely driven working dog, there are no such things as days off. These are the shepherds you see in videos of extreme obedience trails, etc. etc. It's what some professional trainers want in a dog, but it's generally way outside the realm of your average pet owner.
A well-bred dog meant as a companion/pet may have some drive while still managing an 'off switch' where they can exist inside a house without going insane. This is with multiple hours of exercise a day.
Yes, there are working dogs who would never be able to manage this feat.
Things to keep in mind when writing:
A herding dog has a light, fleeting sort of prance to their steps. They're made for quick, tight movements and it shows in the way their body flows with their steps.
Your average working dog can't thrive on two thirty minute walks a day and otherwise being left to their own devices. Make sure your character actually can realistically navigate owning that kind of animal - if they can't, incorporate that into the dog's character ('bad', destructive, 'psycho'. Think Kypto)
Herding breeds are quick to nip, and it circles back to their original herding purpose. Cattle dogs are especially prone to this, as biting is part of how they herd cattle.
They love to nip at ankles and feet, especially when kids run around.
Certain herding dogs are aloof with strangers, as many were bred to serve multiple purposes, meaning they have also been bred to be suspicious of outsiders.
Herding breeds need room to run
A herder who ain't herding and ain't getting the right enrichment will literally develop OCD. It's a thing.
Always assume they're smarter than you because they probably are.
They will break your stuff for fun and just to watch you suffer.
Skipped their walk? Oops there goes the couch, bitch.
Are very cute as puppies but it's actually to mask the fact that they are demons. Nothing is safe. Not you. Not your chairs. Not your cats.
OK so let's now look at another type of working dog
Livestock / Guardian Dogs
I'm lumping human guard dogs in with livestock guardian dogs because there's a decent overlap in their behaviors. I'll refer to Livestock Guardian Dogs specifically as LGD to spare my sanity.
LGD are typically very large and very powerful. These are your breeds such as the Anatolian Shepherd, or the Kangal, or the Central Asian Shepherd. You also get your Maremmas and your Great Pyrenees. If you have a rural character who farms, these are all breeds you could consider.
These are generally very no-nonsense dogs. If the herders gave you any slack at all, the LGD will not. They are not designed for urban life and can, in the wrong hands, be extremely dangerous. They are regularly banned from grooming facilities and dog boarding, and require extra precautions during vet visits.
With a responsible owner and the right environment, these guys are worth their own weight in gold for a farmer. They will fight to the death to protect their flock, and that's what makes them so dangerous to own willy-nilly.
Things to keep in mind when writing:
Guard dogs are loud as all get out, y'all. Their job is not to bite people or to fight scary animals in the dark - it's simply to keep their flock and their people safe. They mainly do this by staying up all night long barking at anything that moves or threatens to move.
LGD in particular love to sleep outside and will be so excited about camping bc omg human is also outside???
As long as they know you, guardian dogs are very mellow and usually quite pleasant-tempered. They have to be able to coexist with lambs and babies, after all, if they're going to protect them.
If you win over a guardian dog, you have a pal for life, but if you approach their flock/family the wrong way, that friendship is old news.
Will usually prefer goats to people and that's okay.
Sheds like a maniac. It's disgusting.
They always have poop crusties somewhere.
Can and will bite very willingly when pushed.