I love my Collie, she reminds me of Lassie!
Oh how cute! 
You're probably not old enough to remember the television series.
I know of it but I don't know when it first aired, do you?
I believe it was 1954 where the collie, who originated in Scotland was made a star
Oh wow yes I was not born yet and I didn't know Lassie was from Scotland. I wonder how Lassie got the part.
Lassie was a fictional character and many different dogs filled the role
How many dogs? That is crazy that they would have to find so many to play the part that looked similar. 
Collies are often bred for their distinctive type
Oh I didn't know that. You seem to know a lot about Collies.