There are various ways you could say it:
Spike is ainm do mo mhadadh
Spike an t-ainm atá ar mo mhadadh
Is é Spike ainm mo mhadaidh
"Madra" and "madadh", by the way, are just the words for dog in different dialects. I use "madadh" since I speak Ulster Irish, but you could use "madra" just as well in the above sentences.
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