Sims 4: Where did my puppies go?

I recently had two puppies that came from my former two dogs. I went to the hospital so my Sim could have her baby and I came back they were their, no problem. Until, I went upstairs to give my dog a bath because he was smelly I come back downstairs and their gone!! They aren’t even on the sim selection either? I go outside thinking they ran away and I see trash piles everywhere and hair piles everywhere as well.. Last I could think they died.. but how? So I checked my notification wall and it didn’t say anything about them dying. Last thing was said was that one became good friends with a sim of mine.. Any help on where they went. I refreshed my game and still no sign of them. ☹️((