Yes, but you need to feed the Rottweiler in stages. For example, if it’s a 3 lb watermelon, cut up 2 lbs of watermelon for dinner with some grinding bones in there too.
The next day makes sure they have plenty of fresh watermelon juice with no seeds or pulp or anything when they wake up and then when they are done go ahead and give them the third pound of fruit again. If you have any concerns about your dog being able to digest long chunks of raw fruit eat them before feeding them to Fido…