I would be inclined to watch and wait. It's easy to worry and think of all the worst things that could connect all this.
Sometimes a hundred tests could be run with no answer and stress both yourself and your dog.
I guess it depends on whether the worry as to what it could be is overwhelming and your own peace of mind needs addressing. If that makes sense.
Testing for things causes stress as much as the not knowing. Which is easier to live with?
I normally go for a less is more approach myself, but I know everyone id different.
Positive thoughts for you Helen.