I want to ask my neighbor violinist to stop practicing at home for my dog
Do they practice it too much?
He practices every day and most of the time between 5 pm and 10 pm and even midnight and 4 am.
It is ok to insist people stop playing loud music if you are being disturbed by it. They should find some place to practice elsewhere.
It disturbs especially my dog when it is asleep.
Maybe talking to them so that they can see where you are coming from will help you both. I bet that if you asked him to stop practicing during certain hours, that he would be understanding of your requests.