1) Animal-powered transport 2) Drudge has wrap with heroin 3) Pack animal 4) Sumpter 5) Type of horse 6) Workhorse 
A packhorse or pack horse refers generally to an equid such as a horse, mule, donkey or pony used for carrying goods on their backs, usually carried in sidebags or panniers. Typically packhorses are used to cross difficult terrain, where the absence of roads prevents the use of wheeled vehicles. Use of packhorses dates from the neolithic period to...
A packhorse is a horse used to carry goods. Even with the invention of the combustion engine and the development of trucks and lorries, packhorses remain a useful means of carrying loads through difficult terrain such as mountains, where wheeled transport cannot operate.
[n] - a workhorse used as a pack animal
noun a workhorse used as a pack animal