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Hi Karen. this is Dr. Gabby. I checked the ingredients in Zims Max Freese and it contains tea tree oil which can be toxic, and cause neurologic and kidney problems, in cats and dogs. So I would not use that.
You can use topcial Arnica cream.
But it sounds like he needs something stronger than Rimadyl. Maybe Tramadol (a mild opiate) and/or a muscle relaxer. The emergency clinics are open 24/7. You could take him in now and get something stronger than Rimadyl. If he has a herniated disc in his back he may need prednisone or cortisone as well.
I would also use an ice pack on his back 20 minutes every hour until bedtime.
Does that help? Do you have any additional questions?