
We never took a deposit. We liked to keep our options open. I realise, from the other side of the fence, a buyer would want to make sure they have been able to book a puppy but in this instance, with the litter only being a week old, NO WAY. I'd be looking at that as tempting fate!!! With our puppies, and fact is Basset puppies just look like any other puppy (no ears down!) so could be quite disappointing for a prospective new owner to come and not see a puppy with long ears, we didn't have anybody in until they were at least 5 weeks, and probably even older. And then there's the fact that we only bred for our next generation, so wanted/needed as much time as possible to make a preliminary choice ourselves.
This selling puppies can be fraught - I had 4 survivors in a litter, one of each, and had two fellow-breeders almost fighting on the front lawn over which of the two males I had available initially. In the end it got so difficult, with one especially, that I decided to keep the best bitch and one of the two males myself. And the other breeder I sold the other male and female to (big mistake, but that's another story). On the other hand, most of my buyers were quite happy to take my advice re which puppy I felt best suited them and their life-style. I did have two, over the years, I had to take back, but that was more a rescue situation than anything else.
To answer this question - no. Don't take a deposit at this stage and all you can do is say there should (note should because at only a week old who knows) be a puppy for them. If they don't like that and decide to go elsewhere, you will have other homes available - count on it.
ps - With my current two, which were both buy-ins, a year apart, I'd been to see the breeder when mum was still pregnant. Then again when the litter had arrived and were around 3 weeks as I recall. At that time, I was able to select the bitch I most liked the look of (she wasn't keeping a bitch). I went again in another couple of weeks, and at that time did give her a part-payment for the one I'd originally thought was 'the' one, but that was mainly because I wanted to pay some of the overall cost rather than paying it all at the time we bought her home (at 9 weeks). It just suited all of us that way. With my Basset, he was 4 months when we bought him so it was paying the full amount up front when we collected him. No deposit situation.