I get so horribly aggravated. My old vet would never buy smaller tubes knowing that I have minis. I offered to pay for the tubes. I suggested I pay for three. 2 for her and one for me to keep. She never would. However I found out from a friend that aquarium tubing will work Cut a long legnth. Say... measure from her flankto her chest, up her neck, the legnth of her head and atleast a foot longer. Cut it that legnth, dull the ends quickly with a burning match so it is not sharp. It will take a little longer to put any oil down it because you need a smaller syringe to fit on the outside end.
I understand they make tubing for goats, that would be the right size. I wish you all the best of luck. Prayers headed your way too.