I guess it does not matter the size really, but I have 2 min pins and the older of the two seems to have nails that grow like weeds!! I take her every 10 days at the moment!!! Lilly only goes every 2 months and even then she does not need it! Ideally I would like to take Violet once a month but its just not happening! I walk her on concrete AND she runs around all day freely outside/and in (we have 2 doggy doors) so they both go and run as they like. Any suggestions for me??