So I know some people here have different experiences with dogs of different sizes living in the same house, but I will share my experiences. I have an almost eight year old poodle or poodle mix the size of a mini, and at times, she still has a lot of energy. When she is excited, she races around the room and jumps on furniture without looking. I also have a maltese/poodle mix that is about 3-4 pounds smaller (toy size dog). On numerous occasions, she has almost jumped directly on him because she jumped on the couch without looking, and two times she has already landed right on him. Now, he is a year older than she is and has some health issues, so he can't get out the way very fast, but Miracle has even surprised the humans she lives with and has landed on them. I would worry about the size difference between a mini and a standard, but that's just me.