First of all, I'd be careful with any small breeds around horses. Don't want anyone stepped on, lol.
Of those three, pugs are definitely the lowest energy breed.
Anyways, papillons are one of ‘my breeds’. I’ve had three in my life so far and know quite a few. They’re wonderful wonderful dogs. My favorite toy breed and probably my favorite breed all around.
Papillons are a high energy breed. They don't need much formal exercise as they get a lot of exercise running around inside, but they are very very active dogs. Papillons don't require long walks or anything, but do appreciate a good walk and a long game of fetch. They also get the zoomies a lot more than any other breed I've had. (Zooming around the house as fast as they can). They are also a very intelligent breed. They don't do well being left alone for too long as they can tend to get 'creative'. They enjoy training and mental stimulation and seem to do better if they have an outlet. We do obedience, which they love, they also excel at agility, flyball, therapy work, etc. At the least, they need a large amount of human interaction a day- whether in fun games or training, etc.
They pick up commands easily and have been a breeze to train for me. They do get sensitive at times, so no harsh training methods is essential imo.
They have long hair, but a single coat, so they do not require much coat maintenance. A little trimming on the feet and some people trim around the butt just a bit and you’re done. They should be bathed when needed and brushed at least a few times a week. Doesn’t take long. Also, a comb for the ears is needed. They do not shed badly, but they do shed some. Compared to a breed with an undercoat, though, it is fairly minimal.
They are sort of clingy kinds of dogs. They were always bred as companions and therefore want to be with you all the time. They like to snuggle and be lap dogs for some time, but they are active, as I’ve said. They tend to run for a long while, then crash, then run some more. They are also the biggest goofballs. They really do seem to have a good sense of humor. Most papillons seem to love everyone. (Some are more one person dogs, but the vast majority don’t seem that way)
Some can be vocal, some are really not vocal at all. They bark at the doorbell and at strange dogs in the back yard. They don’t howl or bark for no reason. And if you start training ‘no bark’ early, they should not be yappy.
They are good with older children or children that know how to gently handle a small dog. They’re not that breakable, it’s just when children get rough they can hurt the dogs. Likewise, they’re really good around other small animals and other dogs. If they’re around larger dogs, though, make sure they are supervised.
All in all they are a great breed for someone that wants a friendly, active, incredibly smart little dog.