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A Beatles hit. It’s rumored that, at the end of the Beatles song, "A Day in the Life," Paul McCartney recorded an ultrasonic whistle, audible only to dogs, just for his Shetland sheepdog.

This puppy is so cute. I had a similar one and his name was Raff. He died 1.5 year ago and I still can't stop thinking about him :(
All the best for you and your new friend!