I was wondering whether duine ar bith againn means any of you guys/folks in Irish. I am trying to use it in the following way: An bhfuil madra duine ar bith againn freisin? (Do any of you folks/guys also have a dog)? If not, does anyone know what the Irish equivalent/translation would be?

Thanks in advance/much appreciated.
~Shawn

'Bhfuil madra ag éinne agaibh/duine ar bith agaibh is what I'd say (I'd say the first of those two in speech).

Wait for more.

An bhfuil madra ag aon duinne agaibh?
Has any of you a dog?

'..aon duinne agaibh..." (aon duinne=éinne)
...any of you...


I would think that ...duinne ar bith agaibh...would be more likely to be used in the negative,
Nach bhfuil madra ag duine ar bith agaibh? - Has none of you a dog?

..duinne ar bith againn.. - ..none of us..

I think that's right in any case.

Duine has only one n (even though we pronounce it as if it were a double n in Donegal )

"ar bith" means "any" just like "aon", what makes it mean "no" is the negation that may come before:

An bhfuil duine ar bith ábalta sin a dhéanamh? = Is anyone able to do that?
Níl duine ar bith ábalta sin a dhéanamh. = Nobody is able to do that.

But in such sentences, "aon" is Munster/Connachta and "ar bith" is more Ulster.

_________________
Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

I think in Connacht it also tends more towards ar bith, but aon can also be used.

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

Thanks. I see that I mistakenly typed the wrong form of "ag" there too. Arg.

Oh sorry.
I wasn't trying to say that …duine ar bith was only used in the negative, I was trying to say that I thought it was preferred to …aon duine.. in the negative, although I'm not sure of that either.
I just don't explain myself very well.