Is it true that dogs see the colours yellow and blue the best even though they are supposedly colour blind?

Question: Is it true that dogs see the colours yellow and blue the best even though they are supposedly colour blind?
- Keywords:
  blue,
  colour,
  dog,
  yellow
Asked by HydroDuck to Ed, Hugh on 20 Mar 2015.
- Ed Rial answered on 20 Mar 2015:
  
  Yes
  
  I just Googled it – I didn’t know that!
  
  Ed
  
  p.s. #VoteEd 😉

Question: Is it true that dogs see the colours yellow and blue the best even though they are supposedly colour blind?