Animals (MDPI) Submission Guide: Welfare-First Process (2026)

Animals is not a stronger or weaker version of a subscription animal-science journal. It is a different model. MDPI built it around speed and soundness-based review: the editorial question is whether the work is methodologically sound, ethically reported, and within scope, not whether it ranks among the most selective findings of the year. That model shapes how you should prepare the package.

Three consequences matter most.

• Section fit is concrete. Animals is organized by subfield, with dedicated Animal Welfare and Animal Ethics sections, so scope is assessed against a specific section rather than a vague "is this interesting" bar.

• Completeness is rewarded early. The pre-check is fast and partly template-driven. A technically clean study with a missing ethics-approval code can be returned before a reviewer ever sees it.

• The welfare bar is real. Animals rejects work that subjects animals to avoidable pain or suffering regardless of the quality of the data, which is a sharper gate than many production-oriented animal-science journals apply.

It helps to position Animals against the flagships authors instinctively benchmark against. A selectivity journal in the Nature, Cell, or Science mold rejects sound work for being insufficiently novel; the editor is buying impact, and a complete, correct, in-scope study is not enough.

Animals inverts that contract. It does not ask whether your finding will reshape the field the way a Nature, Cell, or Science editor does. It asks whether the work is sound, in scope, ethically reported, and welfare-compliant. That trade is the whole point: you give up the prestige signal of a selectivity venue and you get a fast, soundness-based decision, provided your welfare and ethics reporting is airtight.

The scope signal that authors most often misread is the phrase "within a larger context." Animals gives preference to work that understands the animal in relation to the outside world, including humans, rather than a closed-system physiology experiment with no welfare, behavioral, or ecological framing. A clean metabolic study on a livestock species may be a better fit at a production journal; the same study reframed around welfare outcomes or human-animal interaction fits Animals.

The core fit for most submissions is the original research article. It works best when the animal question is central, the husbandry and methods are reproducible from the text, and the ethics, ARRIVE, and declarations package is complete on first upload.

Ask these questions before you submit:

• is the animal the actual subject of the paper, studied in context, or is it a model system for a general-biology question?
• can a reader reproduce the husbandry, procedures, and welfare assessment from the manuscript and supplementary files alone?
• are the ethics, ARRIVE, and data statements complete and specific, or are they still stub text?
• does the welfare reporting show that the 3Rs were considered, not just asserted?

If the answers are uncertain, the pre-check problem is usually more important than the science problem.

The pre-check editor is answering a short list of questions fast, and at Animals the welfare question sits at the top of that list.

On scope, the editor asks whether the manuscript belongs in an animal journal and in which section. If the animal relevance is thin or the work is general biology with an animal model, the paper is redirected or returned. On ethics and welfare, the editor checks whether the study obtained the required committee approval, reported it with a project code and date, completed the ARRIVE 2.0 checklist for any live-animal procedure, and avoided causing avoidable suffering. This is the gate that separates Animals from most journals: welfare reporting is not a formality here, it is a rejection criterion.

On soundness, the question is whether the methods, including husbandry, are reproducible and the analysis appropriate. Animals does not require the finding to be field-defining, but it does require the work to be done correctly, reported in full, and powered well enough to support its claims. On completeness, the editor looks for the declarations block. A manuscript missing Author Contributions, Funding, Data Availability, or the Institutional Review Board Statement reads as not ready, even when the science is fine.

Manuscript structure: Animals expects the standard MDPI section set: front matter (Title, Authors, Affiliations, Abstract, Keywords), then Introduction, Materials and Methods, Results, Discussion, Conclusions, and a back-matter declarations block. The abstract is the first thing the pre-check editor reads, so the animal question, the welfare or behavioral angle, and the main result all need to be visible there.

Reporting and methods readiness: Provide full experimental detail so the work can be reproduced, and follow the design-appropriate guideline. ARRIVE 2.0 is mandatory for any in vivo animal procedure; supply the completed checklist. Use PRISMA for systematic reviews and meta-analyses with a registered protocol, and CONSORT for randomized controlled trials in clinical-veterinary work. The methods must carry a real husbandry account: species, breed or strain, age, sex, group size, housing, feeding, environmental enrichment, humane endpoints, and how welfare was monitored.

Declarations and ethics: Draft the Institutional Review Board Statement (with committee name, project identification code, and approval date), the Informed Consent statement where owners or human participants are involved, Author Contributions by initials, Funding, Data Availability, and Conflicts of Interest before you upload. At MDPI these are pre-check gates, not post-acceptance paperwork.

Figures, graphical abstract, and supplementary assets: A graphical abstract is optional but commonly used; for an animal study it should communicate the welfare or behavioral finding at a glance, not just the experimental apparatus, and should be supplied as a high-resolution PNG, JPEG, or TIFF. Use supplementary materials for the husbandry table, the ARRIVE checklist, raw behavioral or physiological datasets, ethogram definitions, and video where behavior is the outcome. ORCID is expected for the submitting author, and the system will ask for suggested reviewers in the relevant subfield.

In our pre-submission review work with Animals manuscripts, four failure patterns generate the most consistent pre-check returns and reviewer friction, and each is testable against your own draft before you upload. The four, in the order they bite: welfare-and-ethics reporting gaps, missing ARRIVE 2.0 compliance, descriptive husbandry with no mechanism, and scope drift where the animal is incidental.

Across our Animals pre-submission reviews, the pattern that surprises authors most is that the pre-check is not a quality filter in the Nature sense; it is a welfare-completeness-and-fit filter. The manuscripts that get returned fastest are rarely bad science. They are competent studies whose ethics statement, ARRIVE compliance, husbandry reporting, or scope angle is not ready for a fast, template-driven screen with a strict welfare bar. Manuscripts coming through pre-submission review for Animals split cleanly along these four lines.

Inadequate animal-ethics and welfare reporting

The single most common pattern we see is an animal study whose ethics and welfare reporting cannot survive the pre-check. The Institutional Review Board Statement is missing the committee name, the project identification code, or the approval date; the methods describe procedures with no humane-endpoint definition; or a study that involved a painful procedure offers no analgesia or refinement detail.

Animals treats avoidable suffering as a rejection criterion and the ethics statement as a gate, so a single missing approval code can return the manuscript before review. The testable version of this failure: read your own Materials and Methods, and for every procedure that touches a live animal, confirm there is a named committee, a project code, an approval date, and an explicit welfare-monitoring and humane-endpoint statement. If "ethical approval was obtained" is the entire sentence, it is not ready.

Check whether your Animals ethics and welfare statements clear the pre-check →

Missing or incomplete ARRIVE 2.0 compliance

The second pattern is a live-animal study with no completed ARRIVE 2.0 checklist, or a checklist whose items point to "see Methods" when the Methods do not actually report them. Animals requires the ARRIVE 2.0 checklist for any in vivo procedure, and reviewers in the welfare and ethology sections read the methods against it.

The recurring gaps are unreported sample-size justification, no randomization or blinding statement for behavioral scoring, no description of the experimental unit, and no 3Rs (replacement, reduction, refinement) reasoning. The testable version: download the ARRIVE 2.0 checklist, walk your manuscript against every Essential 10 item, and supply the completed checklist as a supplementary file. If you cannot point to the exact sentence in your methods that satisfies each item, the reporting is not ready.

Check whether your Animals manuscript meets ARRIVE 2.0 reporting →

Descriptive husbandry with no mechanism or welfare relevance

The third pattern shows up at the reviewer stage: a study that describes a husbandry condition, a diet, or a management practice and reports an outcome, but offers no mechanism, no welfare interpretation, and no animal-in-context framing. "We changed the feed and measured growth" is a result, not a contribution, unless the paper connects the change to a physiological mechanism, a welfare outcome, or a management decision a reader can act on.

Animals favors work that places the animal in a larger context, so purely descriptive husbandry reports that could appear in any production-trial database tend to draw "insufficient novelty" or "out of scope" reviews. The testable version: state, in one sentence, what a reader can now understand or do that they could not before reading your paper. If that sentence is only "this group differed from that group," the contribution needs a mechanism or a welfare frame before submission.

Check whether your Animals husbandry result has a welfare or mechanism frame →

Scope drift where the animal is incidental, not central

The fourth pattern is scope drift: the study is really a molecular-biology, biochemistry, ecology, or methods paper, and an animal model has been added so the work can target an animal journal. Animals is section-based and organized by subfield, so the pre-check editor must place the manuscript in a specific section such as Animal Welfare, Animal Behavior, or a species-focused section.

When the animal is incidental rather than central, the section assignment fails and the paper is returned or redirected fast. The testable version: read your own abstract and introduction, and ask whether a section editor could name the animal-science subfield from the first paragraph alone. If the animal angle only appears in the methods, or the real question is a molecular pathway that happens to use a mouse, the framing is too thin for the pre-check, and a general-biology journal is the better target.

Check whether your Animals scope angle is central enough for pre-check →

Each of these is something you can check against your own draft before you commit the submission. This guide tells you what Animals editors look for; the review tells you whether YOUR paper passes the pre-check before you upload. We have reviewed manuscripts targeting animal-science, welfare, and veterinary journals, including Animals and its open-access peers. Paid Manusights reviews include a 60-day money-back guarantee, and we do not train models on submitted manuscripts.

Run an Animals submission package check to see whether your welfare scope framing, ethics statements, and ARRIVE compliance will clear the MDPI pre-check.

Animals reports a median first decision near 18 days. Treat this as a planning range, not a promise: behavioral and field studies in less-common species often run longer because reviewer search takes time in specialized subfields.

• Day 0: Submission via SuSy. The portal accepts the package and routes it to the section editor for pre-check.

• Days 1 to 3: Editorial pre-check. The editor screens welfare and ethics completeness, ARRIVE compliance, scope fit, integrity and plagiarism checks, and basic soundness.

The fastest returns happen here, before any reviewer is invited, and the welfare gate is the most common cause.

• Days 3 to 7: Reviewer invitation. Manuscripts that pass pre-check enter single-blind reviewer search, typically targeting two or more reviewers in the relevant animal-science or welfare subfield.

• Days 7 to 18: Peer review and first decision. Reviewer reports return and the editor issues the first decision, with a median near 18 days from submission.

Major revision is the most common outcome for papers that clear pre-check.

• Days 18 to 36: Revision and acceptance. Revisions are usually requested on a short clock; resubmission and a second review cycle commonly land acceptance inside a few weeks for in-scope, welfare-complete packages.

• Days 36 to 40: Production and publication. Production is fast once the scientific decision clears, so the slow part of the calendar is reviewer search and revision.

This guide was researched and built from primary sources: the sources we checked include the Animals Instructions for Authors, the journal's aims-and-scope and editorial-process pages, the dedicated Animal Welfare and Animal Ethics section pages, the ARRIVE 2.0 reporting guidelines, MDPI's research and publication ethics policy, and Manusights pre-submission review patterns from animal-science manuscripts deciding between Animals and peer open-access animal and veterinary journals. We reviewed and compared current MDPI author guidance with recent Manusights work reviews from authors weighing Animals, Journal of Animal Science, Animal (Cambridge), Frontiers in Veterinary Science, and Applied Animal Behaviour Science.

Source limitations: MDPI can update APC, article-format details, abstract caps, and editorial-process numbers after this review date, so verify final administrative details against the official Animals author pages before upload. Median timelines are reported by the journal and vary by subfield. Use this guide for the decision the official instructions cannot answer: whether your welfare scope framing, ethics statements, and ARRIVE compliance are ready for the MDPI pre-check.

• Animals (MDPI) journal profile and metrics
• PLOS ONE submission guide
• Is PLOS ONE a good journal?
• Best veterinary journals
• Rejected from Frontiers in Veterinary Science, where next?

Before you upload, run your manuscript through an Animals submission readiness check to catch the welfare-scope, ethics, and ARRIVE gaps the MDPI pre-check filters for. The check is free to run (/ai-review) and takes a single upload.