I recently lost our pug (age 12 1/2) this past March. We now have a pug-shih tzu mix we rescued. Here's my training tips- and I must say the pug was sooo easy to train. Take a hot dog, slice it into "pennies". Cut each penny into 4 pieces. (Very small pieces) Carry zip loc bag with you. When pup does something good- praise and give "treat". Crouton was trained in no time at all.
We kennel our dogs at night until they can be trusted. First thing in the morning- out the door to do her duties and a treat. We also taught our dogs to be "off leash" as we live on 34 acres.
My daughter rescued her pug, Spencer 4 years ago. He was used for stud and we were told kept kenneled 24/7. Using this technique and going out with the 2 other dogs we had, he was trained in 3 days.
Good luck! (Love your new baby- how I still miss my fawn colored Crouie!)