What should iI call this?

[jungliston1]

Hello all, got a new puppy so, twice a week Im going through the yard and picking up any rocks. First week we had him was chewing on any rock he seen. So, I found this one slighlty buried in the dying summer grass and looked a little like lava. When I looked closer, it looks more like a piece of breccia or conglomerate( just not enough different stones). I thought maybe a landscape lava rock from HomeDepot or Lowes, but no matches. What are you thoughts? Thank you for the help.
Edward M.

 

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[jungliston1]

Sorry here are the picks.

 

[dts52]

Part of an old brick?

 

[Eu_citzen]

Where was it found?

 

[DDancer]

Pumice or old brick are my toughts but as EU says Where? Locality helps in identification.