Exhibit 5.1

    September 21, 2020

Chewy, Inc.

1855 Griffin Road, Suite B-428

Dania Beach, Florida 33004

Ladies and Gentlemen:

We have examined the Registration Statement on Form S-3 (as amended or supplemented, “Registration Statement”) filed with the Securities and Exchange Commission (“Commission”) on September 16, 2020 under the Securities Act of 1933, as amended (“Act”), by Chewy, Inc. (“Company”). The Registration Statement relates to the offer and sale from time to time, pursuant to Rule 415 of the General Rules and Regulations promulgated under the Act, of an unspecified amount of: (a) shares of Class A common stock, par value $0.01 per share, of the Company (“Class A Common Stock”); (b) shares of preferred stock, par value $0.01 per share, of the Company (“Preferred Stock”); (c) depositary shares representing a fraction of or multiple shares of Preferred Stock evidenced by depositary receipts of the Company (“Depositary Shares”); (d) warrants to purchase Class A Common Stock, Preferred Stock, Depositary Shares, or any combination of those securities (“Warrants”); (e) contracts obligating holders to purchase from the Company, and/or the Company to sell to the holders, a certain amount of Class A Common Stock or Preferred Stock at a future date or dates (“Purchase Contracts”); and (f) units consisting of one or more shares of Class A Common Stock, Preferred Stock, Depositary Shares, Warrants, Purchase Contracts or any combination of such securities (“Units” and, together with the Class A Common Stock, the Preferred Stock, the Depositary Shares, the Warrants and the Purchase Contracts, the “Securities”).

Pursuant to the Registration Statement, the Company has proposed to issue and sell 5,100,000 shares of Class A Common Stock (the “Firm Shares”) and up to an additional 765,000 shares of Class A Common Stock (the “Option Shares” and, together with the Firm Shares, the “Shares”) to cover the exercise of the underwriter’s option to purchase additional shares of Class A Common Stock), all of which are proposed to be sold to the Underwriter (as defined below) pursuant to that certain Underwriting Agreement, dated as of September 16, 2020 (the “Underwriting Agreement”), between the Company and Morgan Stanley & Co. LLC (the “Underwriter”).

In connection with this opinion and the registration, issuance and sale of the Shares, we have examined originals, or copies certified or otherwise identified to our satisfaction, of such documents, corporate records and other instruments as we

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September 21, 2020

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have deemed necessary for the purposes of this opinion, including (i) the organizational documents of the Company, (ii) minutes and records of the corporate proceedings of the Company with respect to the registration of the Securities and the issuance and sale of the Shares, (iii) the Registration Statement and the exhibits thereto, (iv) the base prospectus, dated September 16, 2020, filed with the Registration Statement relating to the offering of the Shares, (v) the preliminary prospectus supplement, dated September 16, 2020, in the form filed with the Commission pursuant to Rule 424(b) of the Securities Act relating to the offering of the Shares (the “Preliminary Prospectus Supplement”), (vi) the final prospectus supplement, dated September 16, 2020, in the form filed with the Commission pursuant to Rule 424(b) of the Securities Act relating to the offering of the Shares (the “Final Prospectus Supplement” and, together with the Preliminary Prospectus Supplement, the “Prospectus Supplement”) and (vii) the Underwriting Agreement.

For purposes of this opinion, we have assumed the authenticity of all documents submitted to us as originals, the conformity to the originals of all documents submitted to us as copies and the authenticity of the originals of all documents submitted to us as copies. We have also assumed the legal capacity of all natural persons, the genuineness of the signatures of persons signing all documents in connection with which this opinion is rendered, the authority of such persons signing on behalf of the parties thereto other than the Company and the due authorization, execution and delivery of all documents by the parties thereto other than the Company. We have not independently established or verified any facts relevant to the opinions expressed herein, but have relied upon statements and representations of the officers and other representatives of the Company.

Based upon and subject to the foregoing qualifications, assumptions and limitations and the further limitations set forth herein, we are of the opinion that the Shares are duly authorized, and when the Shares are registered by the Company’s transfer agent and delivered against payment of the agreed consideration therefor, all in accordance with the Underwriting Agreement, the Shares will be validly issued, fully paid and non-assessable.

Our advice on every legal issue addressed in this letter is based exclusively on the federal securities laws of the United States and the General Corporation Law of the State of Delaware (including the applicable provisions of the Delaware constitution and reported judicial decisions interpreting these laws), in each case as currently in effect, and represents our opinion as to how that issue would be resolved were it to be considered by the highest court in the jurisdiction which enacted such law. The manner in which any particular issue relating to the opinions would be treated in any actual court case would depend in part on facts and circumstances particular to the case and would also depend on how the court involved chose to exercise the wide discretionary authority generally available to it. This letter is not intended to guarantee the outcome of any legal dispute which may arise in the future.

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September 21, 2020

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We do not find it necessary for the purposes of this opinion, and accordingly we do not purport to cover herein, the application of the securities or “Blue Sky” laws of the various states to the sale of the Shares.

This opinion is limited to the specific issues addressed herein, and no opinion may be inferred or implied beyond that expressly stated herein. We assume no obligation to revise or supplement this opinion should the present federal securities laws of the United States or the General Corporation Law of the State of Delaware be changed by legislative action, judicial decision or otherwise after the date hereof.

This opinion is furnished to you in connection with the filing of the Registration Statement, and is not to be used, circulated, quoted or otherwise relied upon or otherwise referred to by any other person for any other purpose.

This opinion is being furnished in accordance with the requirements of Item 601 of Regulation S-K promulgated under the Act, and no opinion is expressed herein as to any matter pertaining to the contents of the Registration Statement, other than as to the specific issues addressed herein, and no opinion may be inferred or implied beyond that expressly stated herein.

We hereby consent to the filing of this opinion with the Commission as Exhibit 5.1 to the Company’s Current Report on Form 8-K and its incorporation into the Registration Statement. We also consent to the reference to our firm under the heading “Legal Matters” in the Prospectus Supplement constituting part of the Registration Statement. In giving this consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission.

Very truly yours,

/s/ KIRKLAND & ELLIS LLP

KIRKLAND & ELLIS LLP