Chicago P.D.” actress Sophia Bush, who plays Detective Erin Lindsay on the NBC series, has got a new best friend. The actress recently put down her former best friend, a beloved dog named Patch, seven weeks ago. The rescue had a special place in her heart. Bush has been raised with dogs in her house.

“They always say if you’re really a dog person you’ll have that one dog in your life, of all of your dogs, that’s ‘the one,’” Bush told People. “That’s what Patch was for me.”

However, soon after Patch’s untimely demise, the NBC star heard of a dog who was surrendered at PAWS shelter in Chicago. He was about Patch’s age. She fostered him for some time before finding him a forever home. “I called him my ‘sweet old man,’ and we coped together for a few weeks.”

A friend suggested Bush that she could foster a puppy for some time. This would ensure that the fur ball is potty trained and used to living in a house. “I was like, ‘That’s a really good idea!’” Bush told the website.

The 34-year-old actress then returned to PAWS and spent time with a litter of puppies. The dog lover went home with a sweet little puppy. She decided to foster her for a few weeks and find her a forever home. But the two bonded so much over the last few days that she decided to keep Frankie for good.

“We’re very bonded,” Bush said. “She’s a sweetheart, and really, really smart.”

The “Chicago P.D.” actress made the adoption official by posting a photo on Instagram. “If you’ve been following along on my snap (sophiabushsnaps) you’ve probably fallen in love with my foster pup. Well, obviously so have I! Frankie is here to stay. Technically, this makes me a #fosterfailure but clearly I’ve won!” she captioned the photo of her and Frankie.

“Chicago P.D.” Season 4 returns Wednesday, Oct. 26 at 10 p.m. EDT on NBC.