Magic Mist- Despite them having nice looking dogs I would not get a pup from them. From the info on thier site and the OFA their breeding practices are not up to the standard that I would consider a good breeder. Thier foundation bitch only had her hips tested, mind you that was back in 93'. The conerning part is that she rated fair and yet they still bred her, twice. The other 2 litters they bred were using a daughter of their foundation bitch. Both of the litters were quite small, first litter had 2 pups second had 1 pup. That's not normal for a Sammie and I would be curious to know why the litters were soo small. Though I would probaly gander that her having the second litter at 10 yrs old certainly didn't help any. IMHO breeding any dog at 10 is too old, regardless of breed. I can't fathom any reasonable excuse for it. Breeding a dog with a Fair rating puts me on the fence with them, but breeding a dog a 10 yrs old is what really pushes me over the edge and makes me question their breeding partices.
Pebbles Run- Well I can certainly see why you may be drawn to them. There's always beautiful ads for Lovey in my dog magazines. However we need to look at things objectively and not just be blinded by all the very big wins. As far as type goes they are all gourgeous, not too over or under done. If were nit picking, I would like to see stronger pasterns(this seems to be a patern here), and more angulation in the rear(both the stifle and hock joints apear to be getting straighter with continued breeding). Again they only do hips and eye testing, I would want to know why they don't do hearts or PRA tests. I noticed that they haven't kept up to date with the annual CERF testing. It's apparent that they know it's an annual test, since they've done it annualy at different times for thier dogs. I also saw they just bred Lovely to Frisco, I personaly would not have bred this litter. Frisco has a Fair hip score and a E1-Lens, punctate cataract *significance unknown. IMO he should never be bred as I can't see what he has to offer the breed that can't be found elsewhere. Lovely is also not current on her CERF, if your breeding to a dog with a know eye problem why have they not ensured that she hasn't developed a problem. The last and only time she had the CERF done was back in 06', so it's not like she was just barely overdue. I'd also be concerned about the hip health of the litter since Lovely's sire rated Fair as well. Honestly looking in more detail at the health results of all thier dogs I would pass on them unless they start significantly changing the bloodlines their dogs are comming from.
Shadow Wood- They tick off all the boxes and then some. To be super critical they only do hips and CERF, same as the rest I would want to know why. However that's the only slightly negative point I can see. They've health tested their dogs since the mid seventies. Their dogs all have a very lovely and consitent type, and I'm not seeing loads of weak pasterns. For the added bonuses not only are thier dogs prety, but they're smart too, with both conformation and obedience titles. They have loads of useful information about the breed, suprizingly not many breeders websites provide information about their breed. I would definitely consider a pup from them.
Celtic Frost- Another good choice here. They do health test, but not CHIC, interestingly they do a thyroid test. Very lovely dogs, a bit long, but balanced overall. The only speed bump that you may have is getting any future pup registered with the AKC. Since they're in Canada the pup will have to be registered with the CKC first and then dual reg with the AKC. Normaly it goes rather smoothly. Thankfully it looks like they have experience with the process, which can be rather confusing. However it can be time consuming and you may have to wait till your pup is older before you can show.