Surprisingly, gretel was bigger this time last year than she is now, which is why i was hoooping lol. But, gretel, even when not pregnant, can look that way, she is SUPER efficient with rumen space.
You may need to get the cattle ones and break them into smaller pieces. I get the Copasure for cattle and empty gel capsules from jeffers and break them into smaller ones for the goats. Approximately 1 gram copper oxide per 20 lbs of body weight is the scale I use. Jeffers carries ones for goats now but they cost 4 times as much per gram.