Metacam needs a loading dose before you can play around with the daily requirements. My last dog was on it for like 5 years - yes, it was expensive but he would have been put down without that extra 5 years if he hadn’t responded. The last 2 were paid for by the manufacturer as he was so off their normal standard and I have a lovely blanket from them :).
My BC is on Previcox - a lot cheaper and more gentle on her tummy. She cannot handle metacam even tho it is a better anti-inflammatory.
BUT human Panadol! Yes, my vet recommends it for my older BC’s “Bad days”. Dose rate - 1/2 of a 500mg pill for a 25kg dog. The lab (who was put down 10 days ago) was on 1 500mg pill for a 40kg dog for reference.
Gee (my BC) has an arthritic wrist - Panadol kills the pain!
BUT PANADOL - paracetamol only. Not with any other additives.