Hello pet parent,
On average, a dog must be hydrated with 20 to 50 ml of water per kg as per their weight every day in summer.
To ensure they're hydrated, you can try flavouring their water by infusing it with dog-friendly refreshing vegetables and fruits like cucumber and berries.
You can also try freezing fruit pulp mixed with some water and give it as treats.
If your pet eats mostly dry food, you could try adding a small amount of water to it to increase their water intake.