Howling dog

[Sounbelievablydull]

Not sure what I'm asking for here really.
We have a 7 year old dog who is really very nice and up till now no problems.
Last week my neighbour called and mentioned that she has been howling all day long.
I work three days per week our other neighbours usually take her out for a walk on these days. I don't think my neighbour would make it up but they can be a little odd at times.
I feel so upset to think she's crying and lonely and I'm not sure what to do about it

How long is she left? It's generally recommended that no dog is left for more than 4 hours.

Well up till a few weeks ago definitely not for long but our circumstances have changed a bit so on the days I work she would be alone for far longer than we'd like or she's used to.
We are all out for about 10 hours at least on those days but she would be taken out for a long walk by my neighbours during that time

Even with a long walk that is a ridiculous amount of time for a dog to be left alone all day, the poor thing

I know and we feel really terrible about it but what can we do? We have seven years where this has not been an issue Any suggestions especially from anyone who's been in this situation would be gratefully received

Can you use doggy day care on those days or could she stay with a friend/neighbour for at least part of the time. I'm afraid that is much too long for her to be left and it's obviously causing her distress