Wolfs can be found in Forest bioms and snow bioms. They can be tamed with bones that you get form killing skeltions. Do not hit a un-tamed or all the dogs in the area will start to attack you. You can Bread the dogs with meat, if the dogs are tamed then the puppy will be tamed too. you can turn a dog back into an egg by right clicking it with a stick, if the wolf was tamed you will have to retame it when you spawn it again. Right click the Wolf (With out a stick) will make it sit (Thanks for reminding me about sitting Zulu9). Wolfs and Dogs are the same thing.
Another face is that their tail shows their health, if their tail is aligned with their back (if their tail is as straight as their back) theyre at full health, and the lower= lower health
Also right click animals (without holding a stick) and they will sit down and stay. However I noticed if I go really far away they will spawn next to me even if I made them sit before.