
Er Actually the Cavalier is how the Blenheim & English Toy Spaniel used to look like before the Vistorians bred them with the short forface as they liked little dogs to look"human"
The Blenheim spaniels were always tan(ruby)& white & were originally bred by the Churchills on their Blenheim estate for retireving/flushing Woodcock. The ones with the Lozenze mark wer the ladies dogs & those without the gentlemens
The English Toy Spaniels were the Tria colours, Rubies & Black & Tans that belonged to the ladies & gentlemen( & Royalty)of the court. They were popular as a dual purpose Lap & Hunting dog from the 1500's
The rise of the Churchill family to favouritizm with the King's & Quuen's led to the two breeds becoming one. Both the King Charles always had them with them as did most of the monarchs
In the 1920's an american came to Crufts & was appalled not to be able to find the King Charles as they looked in the old portraits with longer muzzles & different heads. He offered a prize for the best dog that looked pre Victoria & the rest is history The Cavalier King Charles Spaniel was born
They are totally different in character the cavaliers are must more "open"& outgoing with all people whereas Charlies can be "thinkers". You either like KCS or you don't I think they are nice dogs but don't like the lack of muzzle length & domed heads
The Parti colours in KCS are allowed fleking in the white wereas in the Cavalier it is not desireable & the Cavalier is no longer docked but some KCS are & some aren't The Cavalier is a bigger dog & as everyone else has said much more common
They do come in all the colours, but me being me I love the Blenheims as no two are every totally alike unlike the solids & the Tris have to have the Tan in designated areas