
Dogs are allowed to bark, as long as it isn't for prolonged periods and between 11pm and 7am, then what your doing seems reasonable.
If they complain to the council they will be required to keep a diary of when and how logn the dogs bark.
If this is likely it would be well to invest in one of those security camera's you can get that will tape what they are doing, as it is not uncommon for the complainer to make things up for the diary, so keep your own diary of when they bark when you are there, and also times your not there.
In the 28 years of dog ownership here I had one complaint, about puppies about to leave home following a gale when a fence panel blew down so he could see into my garden, until then he had been unaware of the pups.
He managed one date on his diary saying they had barked from 8am to 8.15pm. I rang the council and explained that pups were a temporary thing, but that no pups could continually make noise for over 12 hours and that I expect the not was 8 - 8.15 when being fed their breakfast, the lady agreed and never heard anything again.
Mind you on the basis it is hard to be mean to those nice to you, the following Crufts I went round and took him some posh cat food, left him speechless, but never whined at us again, where previously little barbs of why not take the dogs with you whenever you go out etc.
When these pups go why not take around to both of them a bottle of Cava, smile through gritted teeth and thank them for their understanding (not).
I too only allow my dogs outside supervised and if they bark they are straight indoors and when I go out they are where they can't see out, with radio on to minimise external stimulus, so I think I'm pretty good neighbour, but know I need to be with 6 dogs.