What's the right dimenhydrinate (Dramamine) dosage for my cats?

You can give ~12.5mg of dimenhydrinate as the cat dose. However, dramamine (same thing) is not a very good medication for sedation in cats. It works well for motion sickness. If you want an over the counter medication that generally works better as a sedative in cats, then try diphenhydramine (benadryl). Give 12.5mg (the children's dose, or 1/2 the adult dose). Benadryl tends to do a better job for sedation. Did your vet possibly say 30 MG, not ML? You're right, 30 ml is an entire ounce of liquid and I doubt that you'd get much in, as little as cats like getting medicine.

It is safe but not very effective for car sickness in cats, For cats, 12.5 mg total dose per cat three times daily. i prefer to prescribe a medication called Cerenia, it lasts longer and is much more effective for car sickness (prescription only from your vet).

Unfortunately, by law it is illegal for the experts at PetCoach to give the dose information for any drug, including OTC drugs, without seeing the animal in person first. That's because doing so requires a veterinary client patient relationship which cannot be achieved via an internet forum. In addition, the experts cannot say for certain if a specific drug is safe for your cat. You can speak to your vet to see if they think it's safe to give this to your cat, and they can tell you the dosage. I can give you a link to a video showing how to pill a cat, and you can practice doing it on your kitty with hard cat biscuits before you go on your trip: https://www.youtube.com/watch?v=aWlpsTh6ddk

Unfortunately, it is illegal for the experts at Petco Pet Education Center, formerly Petcoach to give the dose information for any drug, including OTC drugs, without seeing the animal in person first. I would take Carson into the vet for an exam, and they can give you the correct dose for it.

I'm sorry to hear that Cooper gets car sick - that's no fun for anyone! Hands down, the best anti-nausea medication for dogs is a prescription medication called Cerenia. Benadryl is an antihistamine that can be mildly sedating for some dogs, but it very rarely helps with vomiting and nausea from motion sickness. Children and adult Dramamine have different active ingredients. The dimenhydrinate in the adult form of Dramamine can be helpful with motion sickness in dogs, but it is generally less effective than Cerenia and has more possible side effects. Likewise, at only 10 pounds, Cooper is simply too tiny to be able to accurately split a Dramamine tablet into an appropriate dose. I would strongly recommend asking your vet about prescribing Cerenia. I hope that everything goes well!

I would suggest using benadryl or Dramamine rather then melatonin for your cats if they do not travel well. https://www.petcoach.co/article/6-human-medications-that-are-sometimes-safe-for-sick-pets/

Benadryl will not likely work but you can try Dramamine (NOT the non-drowsy kind). Be sure to give it at least one hour prior to travel and give it when she is not excited or stressed. The dose for a 17# dog would be 1.5 of the 50mg tablets. If you have the chance give it to her a few days before to see how she reacts to it. If she is not quite drowsy enough your can go up to 2 full tablets. Here is an information sheet on the drug with side effects listed. Please read it. ( https://www.petplace.com/article/drug-library/drug-library/library/dimenhydrinate-dramamine-for-dogs-and-cats/ ) Hope this helps. If you have more questions you can always opt for a private consultation where we can chat back and forth. That way you can ask as many questions as you'd like. Best wishes.