Melo is our first Hav (his full brother comes home Friday - so we get to start all over again) and I had no idea what to expect from him. He does have an indoor potty option for days when I am at work, the weather is crappy, and for overnight. Compared to our previous dog, a lab, Melo took a long time to train. He does have a reliable signal - coming up to you and pawing at you - to alert us that he needs to go. He too hated the bell method, and he won't scratch at the door for some strange reason. I had a friend of mine get upset that I allow him to come up and paw at me, but he only does it when he has to go. And, it's not really on me - it's more like a 'hey, I need to go wave'.
I'm hoping that with our new little man, he will catch on a bit quicker, but if not, we now have a little more Hav experience to help us figure him out.
Havanese have been my only breed, so I have nothing else to compare them to, though I do believe those who say that larger breeds learn faster. I have a theory that to larger dogs the whole house is perceived as "den" whereas the whole house is so big for a small breed dog that they have a harder time figuring out that the whole place is off limits for pottying.
In any case, I'm patient when it comes to animal training, and after 40 years of training horses, I understand that every animal (and child for that matter) learns at their own rate. I would NOT be happy with a dog who never house trained, as I've heard is common with many Yorkies. I couldn't live with that. But I can be patient and consistent in training when I am working toward a goal. So far, I have two completely reliable out of three. Kodi was reliable except in terrible weather by a year (then we had to watch him carefully) Pixel was completely reliable by 6 months
The third, Panda, is still a puppy, and has had the complication of two UTI's... One that she is currently being treated for while we are traveling with our RV... An added complication. She did great for the first half of the trip, and I was SO pleased. She has had at least one accident per day since coming down with the UTI, but I can hardly blame her for that. We're just watching her like a hawk, and trying to guess when she's going to have trouble. I suspect that when we get home and back on a schedule, and she's finished her meds, things will get back to normal. I have full confidence that she will become completely reliable too, in her own time. Puppyhood is a journey. Sometimes trying, often delightful, and in the end, a short period in the life of the dog.