Ok, so this isn't totally off topic, but I figure it's better off here than in the main forum.
When you take your dog to the vet and the tech draws blood, from the leg especially, what do you think goes through the dog's mind?
Do dogs know that they have blood and that's what you're taking from them?
Think about it, if you didn't know you had fluids rushing through you, would you freak out if someone suddenly stuck you with a needle and started drawing out this red liquid from your arm?
Better yet, what about subcutaneous fluids? For those who don't know, it involves sticking a needle into the dog's scruff and forcing fluids under the skin from an IV bag. Perfectly harmless and usually used for dehydration, but it leaves the dog with a big lump on their back for a few hours while it's absorbed. Do you think the dog thinks, "Oh my god! Am I going to have this huge lump forever??"
Or maybe I'm just crazy for even thinking about this.... xD