Training questions, puppy (conflicting book advice)

Hello,

TLDR; Can I train my puppy at 9 weeks or too early? Why does Graeme Sims say to not train until 6 months?

I have a 9 week old Chihuahua pup, I have read Graeme Sims The Dog Whisperer (Not Graeme Hall – but is he any good?), I am also reading Sue Ailsby's Training Manuals – I have bought both, and Dr Sophia Yins – How to Behave so your Dog Behaves.

My intention is to train her (Mouse is her name) to be an assistance dog – to remind me to take my medication and other memory based things such as paying for parking when I park the car and if possible some triggers when around my Diabetic son as I struggle to remember things I need to do.

I understand to just start with the basics so it will just be working through Sue A's levels slowly. I have got her an In Training patch for her harness (the harness is a little large even though it's an XXXS).

Graeme Sims says do not start training AT ALL until 6 months old. But… how do I take her to the park or anywhere at all if she cannot walk on a lead or sit. She is quarantined until she is 14 weeks anyway because her last jabs are still a month away. So I want to train her now to sit, come and walk on a long line.

The other two books above do not agree with his 6 month rule so I have started with sit and she is making great progress. She is a tiny baby so I don't want to stress her out but she seems very excited and willing – we only do a little bit each day and we cuddle and praise her all of the time.

She has access to half our garden (the patio part) which is safe enough for her pre-jabs, she wears her harness on the patio and also when I take her out I carry her in a little sling on my front and she wears her harness for practice there too. Everything is rewarded if she is unsure about it, play, toys and kibble. She is very relaxed and happy.

So is that okay? To just start her training now? I end up going round and round in circles if I hear conflicting advice. So I decided to just start on the Sue A and just trust those, they seem to be well respected.

Thank you 🙂