Your dose of 57mg/lb is correct, I usually give it twice a day (every 12 hours). It's usually very well tolerated. To make it easier to give I mix the dose with some softened coconut oil and then freeze until firm. I put it on parchment paper or wax paper. Then I just take out one at dose time and break into pieces and give that way, they usually go down easily. That way you know he got the whole dose.