પાળ્યા તોએ કુતરા, થાડું તો પણ કરજ;

pāḷyā tōē kutarā, thāḍuṁ tō paṇa karaja;

Literally: Even if tamed, they are dogs; even if small, it is still a debt;
What it means: Certain things like debts or dangerous animals retain their troublesome nature and should never be taken lightly, no matter how small or managed they seem.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1923) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.