At an emergency summit in Riyadh, Pakistani, Turkish and Saudi officials reaffirmed the Mecca Joint Defence Agreement, agreeing to deploy forces swiftly.
The pact, signed in August, obliges each nation to assist the other if attacked, a commitment that now translates into tangible troop movements.
Saudi Arabia has faced a barrage of Houthi drone and missile strikes since July, targeting oil facilities and civilian areas in Mecca and Medina.
Pakistan's decision is viewed as a strategic counter to Iranian influence in Yemen, with the Houthis backed by Tehran.
Officials say the Pakistani contingent will be ready within 48 hours, though the exact size remains undisclosed.
The next phase will involve joint exercises with Saudi air and naval units, scheduled for early next month, while displaced families in Hodeidah await renewed stability.