Pug
Don’t think that these dogs are stupid because of their smooshed-in faces and bug eyes; instead, realize that they simply enjoy pushing your boundaries. When training, establish boundaries so that the animal knows what you will and won’t tolerate.
Pomeranian
Poms are extremely intelligent dogs, yet they act like princesses and won’t listen if they’re bothered. This is particularly true for potty training. If it’s chilly or raining, they could decide against going outdoors to relieve themselves, so if necessary, provide them potty mats.