My 13year Staffie Started Howling Yesterday She's Never Done It

My 13year staffie started howling yesterday she's never done it before. She was winging I let her out in garden for a week then she came laid down in her basket then suddenly sat up howling. Went over and cuddle her but still did it 3times more. Hasn't done it again. I'm worried about her as she is hard of hearing and eye sight not good. Do I need to worry