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Sophie Cobbs celebrated her 20th birthday this month.

What’s so notable about that?

Sophie’s a dog.

The Shetland sheepdog, also called a sheltie, lives in Omaha with her humans, Aaron and Robyn Cobbs. They adopted Sophie from a friend when she was 6 weeks old.

“That’s a good long life for a dog,” said Pam Wiese, spokeswoman for the Nebraska Humane Society.

Wiese said sometimes smaller dogs can live up to 17 or 18 years. But 20 is more commonly the age of a senior cat than a senior dog.

“It’s a wonderful testament to good genetics in the dog and good care from owners,” Wiese said.

Sophie, now gray in the face, weighs 15 to 20 pounds and stands about a foot tall. The typical lifespan for her breed is 12 to 14 years.

The veterinarian’s office that treats Sophie said its file listed her at 19 years old. The family said she celebrated her birthday Oct. 10.