My girl Delilah weighs 950g and is on 0.2ml cat meloxidyl (meloxicam, 0.5mg/ml) once per day for arthritis atm which seems low since its the cat one and everyone says it should be given twice a day etc for reasons that make complete sense to me, but my exotic vet is reluctant to budge on it despite me discussing it. She only prescribes the cat or guinea pig version too as its the only one licensed for piggies, even though I've had the dog one alot before which seems to be stronger, better, bigger bottle, smaller doses, more cost effective etc. I much prefer the dog loxicom version, never had an issue with it so I'm not sure why they suddenly stopped giving it to my pigs.
I've had the same pig of the same weight be given 0.5ml dog loxicom twice daily one moment, but then 0.2ml cat version once per day another time, I've also had up to 0.8ml cat twice a day. I'm just getting conflicting info on it so I just do what the vet tells me. I believe it highly depends on your piggie, their issue and the situation, it varies between vets too, I guess some just aren't as confident or savvy as others to prescribe certain amounts or versions, or they think that's what is best for your specific piggie at that time.
It also is the same medication but has a bunch of different names which just adds to the confusion lol (Meloxidyl, Meloxicam, Metacam, Loxicom etc.) It's easiest and best just to stick to what your vet has told you to give to be honest even though it's confusing, if you're worried it's too much or not enough then ask them if they can adjust it depending on how your piggie responds. But yeah, I totally understand your situation with this lol.
Hoping your sweet piggie gets better soon ❤