Any cow bread but small 1ft 2ft no height increase and under 20k

For a very small dairy cow under twenty thousand, look at Vechur or Punganur, but good milk animals in that budget are rare. For milk purchase, I would still prefer a healthy Jersey cross or small Sahiwal if you can stretch the budget a little. Check milk in your presence, do a CMT test on all four quarters, ask the lactation month, and verify age and body condition. If the cow is above fifty thousand, take a Pashumitra or vet with you.