DO IT! If you can handle another one, that is. I know I'm good with 2
When Sammy came to us, we knew Loki didn't like most other dogs. Big dogs scared him... so we were a little worried when we got Sam. Sammy was re-homed just like this. She was cared for, but they just didn't have the time she needed (and still needs.. Sam's crazy!). Anyway, she came in and was scared and Loki just kind of ignored her. I was worried for about a week and then we caught them sleeping next to each other! 2 weeks or so later they were playing (!!!) something Loki never did before with another dog! Now they love each other.