What is the difference between a sheltie and a collie?

I remember taking care of a collie when I was a kid and the other day I saw a dog that I was sure was a collie but the owner said it was actually a sheltie. They looked like they were identical. What is the difference between the two?

Could a border collie stay home for 8 hours while I am at school?

Hello I’m thinking about getting a border collie. I’m am very aware of the kind of breed this dog is and that it needs its exercise. I will be able to give him the exercise he needs BUT I will need somewhere to keep him for 8 hours at home. If this Isnt a problem, where should I keep him? Backyard, crate , etc. Also house training will not be a problem because summer is coming up, but I just want to have an idea what I will do with one once August rolls in and school starts. Will he tear down the house if I teach him right and wrong during the summer?

What is the average height of a 6month old border collie?

I have a 6month old border collie and he is probably 45-50cm tall from the floor to his withers. I was looking for the overall height on google and it said that they keep growing until they are 2 and that they usually get to about 52-54cm tall.

Does anyone have any ideas what height he should be now?