Omega-3 Improves Your Pet Health

my cousin loves my shitzu but she lives in a tower block and has health problems. does anyone know what kind of dog she should get? she wants as small a dog as possible but she doesnt like yorkies or skinny dogs – think she would like a mini shitzu but this isnt possible- are maltese much smaller that shitzu and would they be suitable.
please consider carefully as this is a big undertaking for her and she really wants to make the right decison thanks