A while back it seemed as though Nintendo was fully embracing smartphone games as a way to gain more exposure for some some of its classic IP. While it seems as though that plan has been tapered back quite a bit, it seems Nintendo is still exploring their options with iOS and Android games. A recently approved patent shows that Nintendo has been investigating how a new Nintendogs game could work on smartphones. The original Nintendogs game shifted a ridiculous amount of copies on the Nintendo DS platform back in 2005. It seems to be a franchise perfectly suited for causal mobile gamers though whether or not it will be released remains unclear, though it does seems a safe bet for success. You can view the patent here.