How to teach a 4 year old dog how to walk on a leash?

I have a four year old border collie mix and she is very smart we got her a few months ago from a rescue shelter she’s well mannered but when I take her for walks she pulls any advice?

How to stop dog messing with open wound on leg?

My collie has an scratch on her leg and she won’t stop licking it and chewing it. We have fleas ( Which are currently being treated for ) and they are making her make it worse.

What can I put on her wound that won’t hurt but will stop her from licking it?

The vet wrapped it and she got the bandage off as soon as we got home. We tried the dog cone and our other dog chewed it off her. We can’t separate the dogs because we have no where else to put our younger one because she is a fence jumper and also a whiner when she isn’t with her ‘big sister’

She’s on medication for the leg but with the licking it’ll never heal and I’m worried about infection. The vet is also at a loss, we can’t put her on tranquilizers because once again she’s with another dog and they do play rough sometimes and I don’t want her getting hurt.
I can’t seperate the dogs. My Rotterman will literatly BARK and HOWL and cry if she cannot see our collie. We’ve had animal control complaints already made because we tried to crate both dogs and our Rotterman wouldn’t stop howling.

What is good and bad about Border Collies as family dogs?

My son wants a Border Collie. We have 2 cats, 1/2 acre land, and busy schedules.

Do they bark a lot? Will they kill the cats? We’ve looked up basic info about the breed, but what’s the REAL scoop, good and bad?

Thank you!!
I am a teacher who is off summers, so we have some time then. The school year is rough, tho’