Whether small or large dog, one rule applies to everyone: Do not give your dog more energy than it consumes, otherwise it will become fat and sick. If you are unsure how much your dog really needs, the recommendations on the food packaging are a great help. But be careful: these are actually only recommendations!
A bustling Jack Russell definitely consumes more energy than a senior pug who prefers to hang around on the couch all day. The recommendations are averages. Take this as a basis and also ask yourself: what is my dog’s temperament? How much activity do I allow him to do? And above all: how much food does he get “on the side”?
The fact that treats have no calories is just a rumor. There is nothing wrong with pampering your darling. But then please do him a favor and reduce the amount of normal feed accordingly. Or increase the walking frequency.
What else you should pay attention to: Never feed your dog directly before the walk, rather afterwards or let him rest for at least an hour after feeding. For small dogs it is usually better to split the food into several rations instead of offering it just once a day. This is simply gentler on the little stomachs – and it’s an excellent trick to make the little gullet believe that it is getting a lot more than before.