Rice is healthy for dogs and can help your dog gain some weight.
But if you really want your dog to gain even more weight faster you should feed the dog both some rice and some chicken.
The chicken will do more than the rice to help your dog gain weight but the rice is also good for a dog to gain weight so it can help too.
You can also buy some dog food that helps with weight gain as it contains more carbs.
If you have a dog that needs weight gain then try using Bully Max Dog Food which is a great dog food for dogs who need to gain weight.
Bully Max Dog food is a bit more expensive than other dog foods but the Bully Max Dog Food does help dogs gain weight so it can be worth it even for the short term.