Am I Famous?

Today is a day of celebration - I think! I was recognised this morning at the gate by cyclist hoomuns as they rode past. I was sat there sniffing nonchalantly at the breeze, trying to work out what to go and sniff at next when suddenly they were upon me, before I had time to work out a suitable opinion to have about cyclists wearing too much brightly coloured lycra (although I think that is an opinion in itself) when one of them started trilling at the top of her voice "Look, there's Jack!". The other one went "Aawwwwwwwwwwww!" I am unsure at the moment whether that was good or not. I will practice my response for another occasion. The Owner has been telling me this morning that I have an ISBN number which is the reason for my day of celebration. I have a question now, what is an ISBN number, do K9's have ISBN numbers and should I be having an opinion on the matter?