There is definately something a bit heavy in her like ID, she could have a smidge of Shire or clydie. She looks like she has welsh feathers so how about either
My vet thinks she is welsh x tb. She has quite a lot of hair on her legs in winter but in summer she has hardly any and she is'nt at all heavy she has got very fine legs think i have a pic of her somewhere in the summer will have a look x.