No harm there. Keeping rodents out of the garden if your living in the country can be a mind altering experience. By loving all creatures big and small they will love you back. You need not try and kill everything in sight. Everybody wants to be happy.
All rodents have a keen sense of smell and have poor eye sight.
So count on their strengths to work for you. You can learn how to keep them away simply by applying the law of least resistance. Use strong smells placed out proper places in and around your garden. Any type of strong smell will do but if its too strong for you it may not be wise. I recommend using Deer Off.