welcome this is a very simple project for beginners but also very fun for expert's.
Step 1: Parts
You will need some simple parts
3) Led or Buzzer
4) A few wire's
Step 2: Build
The Build Is Easy.
Look through the pictures there is pretty much no explanation needed other than the two contacts in the water cannot touch/short and where ever you place the highest wire and the water gets below it the alarm is going to trip
Step 3: Code
The code is very simple, you can probably make it yourself but if you can't download it from my site Here
Step 4: Your Done
your dog will be so happy he will fart rainbows + you can make it your own like send you a email or text when the water is low. there are endless possibilities.