A lot depends on age, breed, and activity of the dog. Dogs that are walking and working all day long, very active and rarely get a chance to lay and relax take a lot more calories than a dog that just lay is around all day long or runs around at their leisure.
Pups need a different calorie count than an adult dog, seniors need different food vs a pregnant female. It all d p nds.
You can ask the vet what they put your dog at for calorie count, but the absolute best guide to hoe your dogs doing is to look and feel their bodied.
Are they chubby and have no tuck at their flanks is or underside. Can you feel fat rolls under their skin, are they out of breath just at a walk? Can you see the heir whole spine bone for bone, or see the bones in their tail?
Besides calorie count and activity, every dog had a similar but different metabolism, what be good for one littermate may not work on its sibling for instance, it may be more active or it’s body may be more efficient in burning the food etc. by feeding the two dogs the exact amount of food daily one may gain weight while the other looses.
As Jojo posted look at your dog, feel your dog, you should be able to feel the muscles, see the ribs barely through the coat and the dog should look fit. Look up obesity chart for dogs to see the different body types.
Your vet can point you in the right direction but it’s up to you to fine tune the amounts, more food if the dogs getting too thin. Less if it’s getting fat.