As I have mentioned on the GET IT command page, while a dog is young many owners make the mistake of killing the willingness the dog has, to give items back into their hands, by shouting, chasing or grabbing the item, if the dog gets hold of something its not allowed to have. Even if you are not training for assistance work it essential for a pet to simply give an item back.
With Bella, from being a few weeks old, I would allow her to have an item then get her to give it back as a game, that set the foundation that giving back an item isn't a bad thing. Personally, I do not allow Bella to play tug of war unless I invite her to, I feel that it is a contradiction of her work for her to think that she can hold on to an item and fight for the possession of it.
There are a few ways I could teach Bella to present me with an item, there is the TWO HAND/ONE HAND technique and with that technique, I would teach her that if I use both hands to take the item, one either side of mouth, she must release immediatley, but if I use only one hand that is an invitation to play tug ... BUT for my personal circumstances this way wouldn't be the best option as I often only have one hand available, also with this technique there is always the possibility that Bella is expecting a game and I wanted to teach Bella the difference between items she can play with and items that are 'work' related.
So the way in which I have taught Bella to present is by simply asking for the item, either in my hands or on my lap, as I am mostly either sitting or in my wheelchair, the easiest way to do that is to use the 'pat my knee' as a command and Bella will place the item in my hands or onto my lap.
To start with I would get Bella to drop/give back an item by getting her 'swap' it for something better like a treat or toy - kind of like tricking her into it but she thinks its a game. Its no good trying to grab the item, as I want Bella to leave go of it voluntarily, so while she was close to me I produce another toy or treat, then as soon as she dropped the item I say DROP IT, her reward for dropping is the tpy or treat. Using a game like this is great for teaching Bella not to be possessive over items and also for getting her enthusiastic and keen to learn BUT its important that created a calm 'present' .
To get a calm present I encourage Bella to come really close in to my legs by patting my knees, that way I have more chance of a successful 'present' , once she has come close with the item still in her mouth, I get hold of the item and say DROP IT, as soon as Bella lets go of the item I reward her immediately and make a huge fuss so she knows she has done the right thing.
If I have a problem with Bella turning away with the item when I try to get hold of it, the best thing to do is once I have called her in close, rather than reach for the item just say DROP IT, and hopefully she will drop the item into my lap - and ofcourse I reward her immediately.