Toy Schnoodles need XS collars that measure about 8" long when they are 8-12 weeks old.
It is not necessary to buy anything too expensive, since your puppy will be growing fast and may need a bigger size before long. Whatever collar you choose, purchase a dog tag to attach to every collar your puppy owns.
For new puppies as well as adult dogs, I have an excellent recommendation. The Snazzy Fido collar easily displays your contact information and is more secure than a tag. I was impressed with the prices of these collars (on sale for $6.95) which are especially reasonable when you consider most dog tags alone cost at least that much. Please consider a very visible identification especially when you are traveling with your pet. If you have a particular weakness for fancy dog collars, you could always reserve them for special occasions at home, or when you have guests...but I especially recommend the very practical Snazzy Fido collar on neighborhood walks, on vacation, or road trips. Remember safety is always our greatest concern.
The Snazzy Fido collar should not replace a micro chip. I always recommend micro chipping your dog as a back up for your pet tags. But the problem with a microchip is that the person who finds your dog has to have him electronically swiped at the vet or shelter before they can contact you. Time is always of the essence when a dog is lost, so having a visible form of identification on your dog collar is very important.
Hope everyone has safe travels this summer!