Possible Clues:

• Sister with sheltie's mounting for a general view
• Is twenty five pounds raised in social security summary?
• General summary
• Mary might shortly follow the sum for this
• Precis or summary
• Animal's taken up by little sibling - that's the general idea
• Horse's knocked over little relative -- that's the general view
• Short story?
• Sketchy summary
• Outline is horse climbing in sunless void