What I was told by the breeder, was feeding your dog on set times, leave it for 10-15 minutes and than take it away if it wasn't eaten completely. It took us a few days to get Cookie into this routine. We were told (and I've also read it) that it wasn't good to leave the food out all the time.

How old is Leika?

When Cookie was a puppy, we would than take her outside to go potty immediately and she would do her business. Puppies always want to go potty after being fed or after they have been drinking.
When she was about 4 months, we started to increase the time after feeding her and now she goes potty 2 hours after her meal because big dogs should rest afterwards otherwise they get problems with their stomach.