Chappy was found wandering on Chapel Street in New Haven and rescued by the Mystic Aquarium earlier this month.

The young pup’s immune system is showing signs of weakness, making him more prone to infections, staff said.

Chappy, the seal that was found wandering the streets of New Haven, now has pneumonia, according to his caretakers.

MYSTIC, Conn. (WFSB) - Chappy, the seal pup found in downtown New Haven, is being treated for pneumonia and gastrointestinal ...

A seal pup that was found on the streets of New Haven is being treated for pneumonia and gastrointestinal issues. The Mystic ...

A heartbreaking update on New Haven’s most famous seal. Chappy, the seal found on the streets of New Haven last week, has ...

A Long Island Sound celebrity with flippers has been immortalized with a special kind of collectible.The National Bobblehead Hall of Fame and Museum has created a bobblehead for ...

A Long Island Sound celebrity with flippers has been immortalized with a special kind of collectible.The National Bobblehead ...

A seal pup that was found on the streets of New Haven captured hearts across the state and the country and soon you will be ...

A seal pup that was found on the streets of New Haven captured hearts across the state and the country and soon you will be ...

The seal, estimated to only be a few weeks old, wandered from a beach and ended up on Chapel Street in New Haven on Feb. 16, the aquarium said.