Our dog would be the perfect advert for these things - I thought I'd get one as treat for him from Tesco a couple of months ago and when he got his teeth round it he ran round the room as if to say "THIS, THIS is what I've been asking for!!!" He absolutely loves them, it's the same reaction every time. Mind you, at £2.20 (ish - they vary a bit), it's once a week at the most, sometimes once a fortnight, and he has to make do with other chews in between.

They come in two flavours, beef or chicken, and are basically a tied, bone-shaped rawhide chew with a meat flavoured strip wound round inside it, and are about 10 inches long ( approx 25cm). It's a substantial snack, but says that it has a low calorie content. It's also sold as an aid to dental health, with a paragraph on the back of the packet extolling its virtues as a remover of plaque and tartar due to its texture and shape. It certainly keeps him busy and he chews it from all possible angles, so he's giving it the best possible chance of getting the plaque off! As ever there is the reminder to always have fresh drinking water available for your dog, and in the case of this particular treat, this is vital - this is the first treat that I've ever given him that's seen him repeatedly empty his water bowl when he can tear himself away from chewing it. I have to be honest that this does concern me a bit as he doesn't normally drink much, and it's a good side-effect from the price that he doesn't have them very often.
There's a warning that they may cause stains when wet (nothing like pale soggy chewed rawhide patches on dark sofa cushions); however the most annoying thing that we find is that the meat flavoured strip fragments all over the place as he trails it around, and unfortunately he doesn't seem to possess the usual doggy tendency of hoovering the floor of every single available crumb of food, so I'm forever having to pick up the bits and wave them under his nose for him to eat!

The main ingredients as stated are Rawhide, Starch, Vegetable Oil and Flavour, with added EC preservatives and colourants, and the typical analysis as follows:
Protein 63.68%
Oil 6.7%
Ash 9.9%
Fibre 1.0%
Moisture 7.0%
They're said not to be suitable for older dogs, puppies under 9 months and dogs under 3kg.

Bonio products are made by Purina, which I've just seen are part of the Nestlé corporation, and have the 'made by appointment to the Queen' crest.