My 8 yo dog was treated Monday with vinblastine for what was suspected as a mast cell tumor. She developed neurological signs 24 hours later including lip smacking, eye blinking, panting and now cannot walk or hold her paws correctly. Her paws are folding under her. Please help, she is critically ill. The vet is now saying the cancer diagnosis is not confirmed so what happens when you give vinblastine to a patient who does not have cancer?