Blackberry/Rasberry leaves & pricly thorns

[Salt n Peppers mum]

Hi everyone,

?/
I've just been collecting grass, dandilions and clovers from my garden as the Pigs haven't been out today with it being wet.
Anyway I found some wild Blackberry bushes in my overgrown boarders and remembered they can have these too
However...... can some one put me right here please, the back of the leaves have small spikey prickly thorny thing going down the spines (Not sure what you call them in leafs). This looks rather dangerous for their little mouths? :{

 

[Joey&Gizmo]

Yes they can have the blackberry leaves and i tend to pull spiky bits off and just give them the leaf without the stem bit with the thorns on, if that makes sense? Also they dry really well and my pigs like them fresh and dry just place them in cool place and wait for the dry out.