Thanks Dr. Kellon!
I'll mention the ertugliflozin to my vet and see if he's able to prescribe it/ figure out what the cost would be. It seems to be in the same drug class as Invokana? Is it just a slightly less expensive version? 
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Helene A. in BC 2021
Photo album:
https://ecir.groups.io/g/CaseHistory/album?id=271068
Case history:
https://ecir.groups.io/g/CaseHistory/files/Helene%20and%20Rosie