Rosella, I would be very careful with metacam. My Buddie developed kidney problems when he was on it after his knee surgery. We took him off the Metacam and his kidney levels went quickly back to normal. My vet thinks Buds reacted badly to the metacam.
If you want to read a bit more about other pet owners and their experience with this drug, please read (you will need to copy/paste the link into your IE address bar):
http://www.arthritis-cats-dogs.com/cgi-bin/datacgi/database.cgi file=Forum&report=Subtopic&SubtopicID=00000114&firstrecord=0&finalrecord=14
Buddie is now on injections of cartophen for a bout of arthitis and it had good results. He is no longer limping and is jumping about as mad as a kitten. He is also been under house arrest for the past 3 weeks (we are allowed to let him out for short periods on the week-end to see how it goes), and on 3 tabs of glucosamine/day for 6 weeks.
Please, please be careful with Metacam.