My 16 month old Portuguese Water Dog Dylan was castrated on 12th March and sent home with Metacam. I dosed him with 24ml (dog weight 24 kgs) as directed on 13th and that night, all night, he had horrible yellow explosive diarrhea - I thought it was a reaction to the op and Metacam was supposed to make it better so give him another dose on morning of 14th - by the afternoon he was lethargic and couldn't/wouldn't eat so phoned the vet who told me to take him off the Metacam - he had diarrhea all that day and night and very little to eat. Yesterday he just lay around and had nothing to eat but we did manage to get some water in to him - last night I was only up 3 times with him and today 16th he has not had to 'go' since about 8 hours ago and has eaten a little chicken so seems to be on the mend.
Having now researched this drug on the internet I would not touch it again with a barge pole!!
My late Bichon Frise was prescribed Metacam (meloxicam) 1. 5mg oral suspension for arthritis. He did not show any symptoms of arthritic pain and was a bouncy, youthful little guy until he was given this medication. After only one dose, he became disoriented, started walking in circles and kept "crying". I immediately took him off these meds and did a search on line about this medication. There were so many side affects that I called the vet to discuss this. He refused to take my call. My little guy lived another 2 years but his quality of life was gone after just 1 dose! Please beware of this drug!