The dwarf plastics where from their 1st generation of models, back when they worked with Renedra, so technically the plastic sprues are very good, and you get lot of options on the sprues (including the dogs)
You can easily find pictures of the sprues :
https://www.google.fr/search?q=mant...ved=0ahUKEwj8qIGvwqnMAhXrKJoKHT5eBkYQ_AUIBigB
The only question is if you like their design or not, myself I found them simple but good.
To my knowledge, the following units are available as hard plastic :
- Ironclads (normal dwarves with hand weapon and shield)
- Ironwatch (dwarfw shooters, the sprue has option for both crossbow or rifle)
- Shieldbreaker (warriors with two handed hammers)
- Rangers (in fact, it's a mix of shieldbreakers and ironwatch sprues to get models with greath weapons and crossbows)
- Ironbelcher canon/Organ gun (the kit can be assembled both ways)
I think that the following kits use the basic plastic sprues from the previous one with metal components to upgrade them :
- Flame canon (Ironbelcher kit with metal components upgrade)
- Jarrun bombarb (Ironbelcher kit with metal components upgrade)
- Bulwarkers (dwarf spearmen, plastic dwarves with metal shields and spears arms, warning can be tricky to assemble)
The brock riders (berserker cavalry) are restic, and the berserkers on foot, as well as most (all ?) heroes are metal.
A note about the berserkers on foot : they look slightly small compared to the armored dwarves (they ave more realistic proportions and look more like normal 28mm rather than heroic 28mm), so depending on your tastes you might prefer using an alternative like the Avatar of War berserkers for exemple.
And of course dwarves being a fairly standard race in Fantasy worlds, you have lots of alternate manufacturers
For starting a dwarf army with Mantic, you have the excellent offers :
Dwarf army at £49.99 :
http://www.manticgames.com/mantic-shop/kings-of-war/getting-started/product/dwarf-army.html
Dwarf mega army at £99.99 :
http://www.manticgames.com/mantic-shop/kings-of-war/dwarfs/product/dwarf-mega-army.html
A very good start might be to buy the mega army or a pair of normal armies.
The mega army give you more with a bombard, a warsmith and an unit of bulwarkers, but with two normal armies you get 20 brock riders so can field two regiments.
Of course there is also the option of starting with the mega army and then adding a normal army (or the reverse), the only potential problem is that this will leave you with one bombar and 5 ironbelcher/organ gun kits, probably more that you might want, but this will leave you option for having 2/3 organ guns (they are rather popular) as well as a pair or normal canons, and it should probably be rather easy to convert one or two of them into flame canons, so having the kit 5 times might even not be enough if you want all options.
Then add or convert a few heroes and you're set.
From other manufacturers, if you want a king on beast, many people use the very nice dwarf king on bear by Scibor, and reaper also has a few options (includinbg a dwarven heroine on bear, or a berserker mounted hero that can serve as a berserker hero on brock)