cur
dog
cur
dog cow mop cot
tar, gob
Most likely "lap".
That is a riddle. The answer is "alphabet". It has three syllables, al-pha-bet, and the alphabet contains 26 letters.
Dog rewards are often called, "Treats", which is a 6-letter word.
Very...Very Nasty
An Australian dog that is also a five-letter word is a Dingo.
emu eel cat dog rat pig cow sow doe
tar, gob