Drinking too much water ???

Picture for tax: My 14 year old shih tzu will gulp his water down every time until he chokes on it. I try and sit and remind him to slow down, it’s not going anywhere but it’s EVERY TIME. This started probably 4 years ago but it’s getting worse to the point he coughs and gags several minutes later too. Does anyone have any advice or recommendations. I hate seeing him like that.

Picture for tax: My 14 year old shih tzu will gulp his water down every time until he chokes on it. I try and sit and remind him to slow down, it’s not going anywhere but it’s EVERY TIME. This started probably 4 years ago but it’s getting worse to the point he coughs and gags several minutes later too. Does anyone have any advice or recommendations. I hate seeing him like that.