Yes! 

I buy them every month for my dog. They are a little over 2 1/2 ft long

I believe it is about 12 inches long from tip of nose to end of hind leg

Yes I wash them all the time and dry them in the drier. Fritz loves them even when the stuffing is gone still a great toy.

This collar does not have the rubber tips. If you were to ask my advice, I would forego getting the rubber tipped spiked training collar for a couple reasons. First, the rubber degrades and they fall off anyway. Second, they take from the effectiveness of the collar and defeat the purpose for using it to begin with. I realize it might seem cruel, but it is not. Since the collars are a slip-fit over their heads, they're not tight unless the dog pulls, and you want them to feel that momentary discomfort when they do as a learning aid. If you take away the discomfort, they may as well be using a simple chain collar alone. Also, if your dog is still pulling through the discomfort, either it's not set up correctly or the they need a different training method. These really should be used in conjunction with a chain collar as backup. They've been known to fly apart when not wanted. I used this collar to train my American Pit Bull Terrier to walk next to me in my wheelchair. Although I don't use it anymore except for retraining purposes, she actually still gets excited when I pull it out because she knows she going for a walk.

Option: Squeeze one of prongs together which releases the collar then able to remove from dog's neck. This application is the one I currently use.

Yes it can be adjusted. Buy the larger size and remove links to fit. They are easily replaced.

Thank you for your question. If you look at the product page (link provided below), the first 3 items are the collars themselves, the second 3 items are addional links in 3-packs. http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=28655

I've seen many brands very similar. Top Paw looks the same.