One thing i dont think has been mentioned really is the Origin of your breed.
Am i right assuming Mojo been a Bullmastiff, therefore a English dog should be able to tolerate cold weather with just his coat ???
Its short hair but try and dig through it to find skin is rather tricky. Bronx has even thicker but alot more coarse coat too. If he is B.M cross Staffy then that makes him twice the Pom dosnt it ??
I'd imagine say a Arican Ridgeback might feel the cold alot more than English breed would ??
Old dogs excluded of course....they deserve warm beds and snuggles everynight no matter what. A little bit of warmed up milk wouldnt go astray either methinks.