Jay wasn’t too happy about it, considering Stella was known to tear things up around the house, but he eventually came around to adoring her, to the point where Sofia Vergara’s Gloria often gets jealous over how attentive and forgiving Jay is for the dog.
The character of Stella was introduced back in Season 2 of Modern Family, in the episode “Good Cop Bad Dog.”
When Jay convinced her original owner Guillermo (played by Lin-Manuel Miranda) to return to college to finish his education, Stella was gifted to the Pritchard family.