When my cat started drinking a lot more water I took her to a vet and she had a bladder infection. This could be the reason your dog is drinking more water.
Why has my westie started to drink more water these last few days?
You should see your vet. It can be signs of infection or something like thyroid or diabetes or kidney trouble and things like that. Westies can be prone to urinary tract issues, bladder cancer, Addison's and EPI (Pancreatic enzyme deficiency) to name a few so you want to check out a sign like that asap (in any dog). I hope it's nothing and your baby is okay. Good Luck.
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May be due to humidity
Maybe because your westie is too thirsty.