Hi guys. My Boston Terrier is about a wk from being 8 yrs old & has always been in excellent health. Out of the blue tonight, without any warning signs, he's walking around the house & at times, seems to slightly lose his balance. It seems that one of his hind legs twitches at times for several seconds, but I notice his face kind of doing it too. Then, his body will kind of be motionless & that's when he loses balance. I've NEVER seen him act like this before. He's not very active in general, didn't eat anything funny that I know of. I've been observing him now for 15 min. I'm almost in tears watching him because I don't know what's wrong! Can anyone give any input? Thanks a lot!