I've always had Borders too and it is true they need a lot of mental and physical exercise.

Because ours always lived outdoors, they never got used to the cats but, as long as I was around, they'd tolerate the cats as they walked by and ignore them and the cats learned to ignore them too. They didn't like the cats staring at them though.
Jess spends a lot more time in the porch which is connected to the kitchen now and is more used to the cats passing her but we still have to be careful. If a cat walks by and she ignores it as she usually does, I praise her.
If brought up with cats and other pets, they are usually just fine but that doesn't mean they'll be great with strange cats but this applies to many breeds not just BCs.


Jess is 13 years old now and she still likes to chase a ball and still goes for walks in vile weather like what we have today. Not stopped raining for about 36 hours and it's heavy.
You need to be sure you can handle taking them out in all weathers too because they don't care what it's doing. I bought waterproof trousers and coat and wellies and alsorts for walking the dogs in rubbish weather.

Another thing about Borders is that they are obsessive compulsive and will develop an obsession with something in their lives. Mine were always obsessed with balls and having stuff thrown for them and would mither you with a ball or whatever 24/7 if they had the opportunity to. This can drive some people mad. If there was no ball around, they'd find something else...anything....If they are out and come across other people, they'd have a quick fuss and then find something to mither those people with...haha.
They also have an obsession with lawn mowers and attack them as soon as you turn them on or even if you just move them back and forth whilst turned off.
Our Jess's father was obsessed with childrens roundabouts. You could set one off going round and he'd chase the handles...forever!!!!
He was also obsessed with water and used to wade in and bat it with his front paw and catch the splashes in his mouth and make silly noises. He'd start swimming and doing the same thing and he'd do this....forever!!!! He never seemed to get tired...ever!!!! If you shouted him out of the water, you had to keep your eyes on him ALL the time otherwise he'd sneak back in and the first you'd know is when you heard him bashing the water and making those stupid noises again.

BCs are often sound sensitive which can be a problem where thunder and fireworks etc..are involved.
They are also prone to allergies, especially flea allergies as they age and I've known a few who can't eat meat...like our Jess although she can now she's older, when she was younger, even chicken made her stools come out as water.
They are also sensitive in mind and harsh punishments do NOT work on this breed. They tend to be a one person dog and make a bond with that one person above everyone else. You'll not get a border collie to bond with the whole family equally. They'll pick one person who spends the most time with them and thats it. Obviously, they'll get along with everyone else but they'll always have a preference for that one person.
Border collies are also very sensitive to how you are feeling and very in tune with their owners. You can't hide how you are feeling from them. You can use small hardly noticeable hand gestures and head cocks as commands. I can cock my head slightly in one direction and the dogs know it means for them to go in that direction and they go.

They are intelligent and trainable in the right hands. If you don't understand dogs well enough, they'll take advantage of you for certain. They are too smart for many people, not just too active.
The pups tend to house train really fast and pick things up really well and fit into routines really quick too.

As the others said, if you don't have a job for them, they'll find their own job...and it won't be to your liking as it usually involves destroying things, excess barking, nervous aggression etc.....

It's funny but all our dogs have been working strain but we haven't had any that herded us or even tried to although they did try to herd other creatures like horses and our Mist even tried to herd a family of ducks on a pond once and she wouldn't normally swim but did in order to herd these ducks.