Our 14 year old chihuahua is having seizures. When she first started having them about 2 years ago, they were about 6 months apart, then she started having them about a month apart, she had one last week and just now had another one. The vet thinks she has a brain tumor. How long should we wait to have her put down? I don't won't her to suffer. Has anyone had a dog that had this. It is so pitiful to watch her have a seizure, there is nothing that we can do, the vet said he could give her something for the seizures, but, it would make her sleep.