Might be Pol's dog. Ever since he left his wife to become president of Ireland, he only has time to wash the cat, thus the dog tends to get neglected...
I have learnt salach means dirty in English. Why is salach now turned into salaí ?
"salach" still means "dirty". But this sentence doesn't use the word "dirty", it uses "dirtiest", which is "is salaí".
Níos salai = dirtier Is salaí = dirtiest
You wouldn't be wanting to put both níos and is into the same phrase.
Superlatives like dirtiest or nicest etc have always" Is" before the word and comparatives like dirtier or nicer always have nios before the word.Check out the Tips and notes.I print them out because I could never at this stage of my learning remember the rules