Today I watched a few hours of vet consultations before ops started.
I’ve seen a few bitch spays ranging from a pup to an overweight bitch- so I definitely understand why the ideal age is 5-7 months. There is less fat and therefore less bleeding (lower risk). However, any younger then the kidneys and liver are far less mature. So they are less capable of tolerating the effects of anaesthetic drugs and less effective at metabolising them, breaking them down and excreting them from the body.
The animal shouldn’t have eaten the night before due to the risks of vomiting when receiving general anaesthetic.
Some bitches will have a pre-anaesthetic blood panel, to ensure the anaesthetic is safe (the vet/vet nurses will look for kidney and liver problems). This is a higher risk with older bitches.
As she was a larger breed, I had to be careful when carrying her back into the kennel as she was conscious again.
I then watched a dental on a dog who was admitted to have plates removed from his leg. This op was a few hours long- apart from dentals, this was the first non-routine op that I have watched.
In the operating theatre, I held up the dog’s leg before the operation commenced, so the surgical field was not contaminated before the drapes were placed around the dogs leg.