In reply to JuanTinco:
Done it twice, May 2015 over 15 days and April 2019 over 12 days, both times however I intentionally missed out the first 2 days through the Cona Glen. A few points and forgive me if you have already considered these. Have you confirmed the ferry and mini bus are still running at the time you arrive at Cape Wrath, I'm sure there is an end date in Sept, if not its a lengthy walk to the ferry point and around the inlet. Also have you checked the MOD activity, I think there is a operation Warrior in action during this month, the web page for Kervaig bothy usually holds this info on the MBA page. If there is MOD activity you will be turned away.
I would say consider a hotel or bunkhouse stop during your stint, this may be difficult with the dog, in case foul weather and no bothies leaves you soaked and fed up. If you have accommodation booked they are usually happy to hold a parcel for you that you could send ahead. I usually include a couple of hotel or bunkhouse stays just to get cleaned up, have some decent food and some beers. Remember you are likely to be out for nearly 2 weeks.
Beware of the weather, I did an attempt in Sept 2014 and had to bail out due to 3 days of gales.
Post edited at 20:32