My sister has a cockapoo...the father was a standard size poodle...love that dog, low maintenance coat, lots of energy, med size - small enough that your child can handle - but not the yappy little dog, smart, when with humans very lovable. I keep telling her I'd take him. Haven't introduce him to the horses, but he gets along well with my dog, and cats.
My dog is a Shep/husky, awesome dog, prefect for the family but doesn't work with your low coat maintenance :-)