A couple years ago, the dog I grew up with started to tense up and fall over whenever she got excited. That was the beginning of the end. Ended up being that she was having the dog equivalent of a stroke, though the vet said dogs can’t have strokes in the sense tha a person does. Eventually, she lost her sight and sense of balance (all in the same day following one of these attacks) and the vet told my parents that the best thing to do was to put her down. Angel was a nearly 15 year old shepherd/basset mix, though. Now I am no vet, but consider the dog’s age and understand that once they start down hill they go down pretty fast.
I’m sorry for the struggle, bro. Hope all becomes well.
Our other Boston ( we had three : the mother and two sons ) died a year ago from lymphoma , and his symptoms were very similar to what you described happening to your dog .
I know he is old , 11 and a half , and realize it’s all downhill from here on out ( heck , same with me ! ) , but just wanted to give him every chance , even if that means he can live only another year or so . I have had lots of dogs during my lifetime , but this guy is my favorite . My best friend - seriously .