Hopes and aspirations for our next litter

So what do we hope to acheive putting our pure Working Cocker spaniel boy on Teagol, who is 62.5% Cavalier, 25% Brittany and 12.5% Poodle (miniature)? 
We will end up with a dog that is technically 93.7% spaniel and 6.25% Poodle. The spaniel then can be broken up to Cocker 50%, Cavalier 31.25% and Brittany 12.5%. Technically some purest fanatics might also say, "You end up with  a mongrel", but a mongrel is actually a dog of no definable type or breed. It you can't see my dogs are spaniels, you may need a little drive to Barnard Castle

​Teagol's Mum is a first cross Brittany/Cavalier, and in that one cross, we managed to produce Blottie with no Chiari-like Malformation (CM)/ Syringomyelia (SM), with having a Cavalier mum, Smudge who is CM graded 2 and SM graded 1, but with putting Blottie to Ernest who is CM graded 2, but has at 4 years old still graded 0 for SM (He has also great heart health on both sides of his Cavalier breeding). Teagol has been graded CM 1, showing no signs so far of SM.
Using a small cocker like Puddin', I hope to correct this little step backwards with improving the stop further and more length to neck with a bit more length in the back to leg ratio.
Puddin' has a lovely length of neck. If you look at breeds being bred with the disease Brachycephaly ​as a ​desirable trait as Cavaliers are being bred, one thing to note is how short their necks are. This seems to be one of the traits that occurs with breeding for a broader in width and shorter in length cranium, along with the muzzle getting shorter. A lot of really important anatomy has to fit into these areas for the dog to be able to breath and regulate body temperature. The concertina effect of brachcephaly with the loss of length to muzzle, then cranium and then neck has a knock on effect causing a reduction in quality in life for these dogs. Just breathing can be a struggle due to the airway being restricted as space becomes a premium and especially regulating their body temperature during hot weather as their Nasal conchae is either compromised by being so compacted or is all but non existant due to lack of space. As can be seen in the CT-scans (below) comparing a dog with brachcephaly to a dog without. 

Sagittal CT-Scans of a normocephalic and a brachycephalic head (Oechtering et al. 2007) 2a =Plica alaris, 2b =Plica recta, 2c =Plica basalis; 3 =Concha nasalis ventralis; 4a =Concha nasalis media (Endoturbinate II), 4b =Concha nasalis dorsalis (Endoturbinate I), 4d =Endoturbinate IV; 5a =Meatus nasi dorsalis, 5b =Meatus nasi medius, 5c =Meatus nasi ventralis, 5f =Meatus nasopharyngeus.

Many French Bulldogs, English Bulldogs, Pugs and Cavaliers die around the world each year from heat stroke, due often because their owners do not understanding that the anatomy they so adore looking at compromises their dogs in such a catastrophic way.
So what we hope to acheive with Puddin and Teagol is a very smart litter of small type spaniels between 8 to 10 kilos at adulthood with a nice length of muzzle, cranium and neck, with a good bit of drive and also still very much enjoy the comfort of their master's lap, but most importantly the anatomy and temperaments that improve their quality of life not reduce it.