For the past few months my girlfriend and I have been thinking of getting another Border Collie. We're open to adopting a puppy or rescuing. We have an 18-month old male Border Collie that we've raised since he was 7-weeks old. The same breeder is expecting a new litter (same parents) this month, and she is offering us first choice of a puppy if we're ready. I have a few concerns though.
I'm worried that my dog will feel betrayed if we get a new puppy. We're very close, and I don't want to lose that bond.
I'm worried that they won't get along.
Is my current dog old enough? A