Join Date: Sep 2011
Location: Germany- but not German =D
Can I ask how many horses you have?
The 4yo and 9month.. any more?
I will be brutally honest, and say neither tend to be beginner friendly ages.
Firstly, finding a trainer is the most important thing. Someone who will guide you and assist.
Secondly, it may be pain related. A vet will be able to check back/teeth and having someone check the saddle fit is a very good idea as they can change shape quickly at this age.