Can I place on an epithet, noun suffixes ?

For example:

{vIghro'wIj tIQ tIch petaQvam}
this petaQ insulted my ancient cat

Is this correct ?

Yes. paq'batlh has petaQ'e', petaQvam, petaQmey, and petaQ'a'.

And yes, the petaQmey is used for beings capable of using language. They're not scattered all about in the passage, so it's being used insultingly.

But in your sentence, the action of the insult is completed, and your English sentence is conveying it that way. Therefore this should be vIghro'wIj tIQ tIchpu' petaQvam This p'takh insulted my ancient cat.

-- 
SuStel
http://trimboli.name