I think two is a good number. I got Roxy when she was 8 weeks old and I work all day long. She wouldnt eat all day until I got home. I felt really bad leaving her so I got a second yorkie one month later! lol! Now I dont feel guilty leaving. They basically sleep and play all day long and being that I just took her to the vet and she gained one full pound in a month, I dont think she is having any problems eating!!!