i did the same mate,had a stafford who was left in house while i worked and after alot of thinking i got a beddy whippet pup which i intent to work(just over 4 months at mo) and they are best mates,they both well behaved and listen,keep each other company as they just play and sleep all day.
and now my stafford is taking a massive interest in rabbits which is being passed onto pup.
dont regret it one bit! atb with your decision