Hi, I'm a bit confused about when to use "deserve" and "deserves" if I'm using "your something".
Eg: Your dog deserve/(s) better and so do you.
Welcome to the forum. :hi:
The use of "your" has nothing to do with it. It's one dog and the word "it" could be used to replace "Your dog" so it takes the third person singular:
The dog deserves better ...
My dog deserves better ...
This dog deserves better ...
If there were more than one dog, the word "they" could be used to replace "XXX dogs" so it would take the third person plural:
The dogs deserve better ...
My dogs deserve better ...
These dogs deserve better ...