My 15 year old Calico has had allergies for years and the latest round of prednisolone has no apparent easing of the severity. I hesitate to increase the tabs to 5 mg from 2.5 per day. I have done the heavier dose and it does not seem to help. Prior years is was a twice a year Convenia shot or Clavamox pill or other AB with a Depo shot. As time went by the effects were decreasing to a point of hardly any improvement. So, I'm thinking try Antihistamines again. She is 10 pounds Any suggestions on product and dosing? I have tried Chlorpheniramine prior and not impressed with the results. Thanks for reading this.