To test for Diabetes - take a urine Sample (ie sit her in a sterile containe) When she urinates test it with a Dipstick if Glucose are present then the vet should proceed to do a pin prick behind the ears. If Glucose are present again, you can be 99% sure she has diabetes. The vet can prescribe insulin.
I am thinking about Maise-Moo having lost a pig to diabetes I know how awful the illness is. In the end I Put Bette to sleep as she went into kidney failure and started passing blood.
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Hugs from me and healing wheeks from Rosie,Rum,Maggie,Milkshake and Pixie and healing squeaks from tiny Gizmo and Twitch