A core principle of occupational therapy assessment is recognising that a diagnosis does not directly explain a person’s occupational needs.

A diagnosis describes a health condition, disability or impairment. However, occupational therapy is concerned with how that condition affects a person’s ability to engage in meaningful occupations and participate in everyday life.

Within assistance animal practice, this distinction is essential.

An assistance animal should not be recommended because a person has a particular diagnosis.

It should be considered because assessment demonstrates that the person experiences specific functional barriers that may be appropriately addressed through an assistance animal partnership.

The occupational therapist therefore moves beyond asking:

“What condition does this person have?”

towards:

“How does this person’s health condition interact with their abilities, environment and occupations to affect participation?”

Understanding the International Classification of Functioning (ICF) Perspective

The World Health Organization’s International Classification of Functioning, Disability and Health (ICF) provides a framework for understanding disability as an interaction between:

• health conditions;
• body functions and structures;
• activities;
• participation;
• environmental factors;
• personal factors.

This framework aligns strongly with occupational therapy reasoning because it recognises that disability is not experienced only at the level of impairment.

A person may have an impairment without significant participation restriction if their environment and supports enable participation.

Conversely, a person may experience significant disability because environmental or social barriers prevent participation.

Impairment: The Body-Level Experience

Impairments refer to problems within body functions or structures.

Examples may include:

• reduced mobility;
• sensory differences;
• pain;
• fatigue;
• altered communication;
• emotional regulation difficulties;
• cognitive changes.

Impairments are important because they provide information about a person’s health experience.

However, impairment alone does not determine occupational need.

Two people with the same impairment may experience very different impacts on their lives.

For example:

Two people may both experience chronic pain.

One person may continue working, participating socially and managing daily activities with effective strategies.

Another person may experience significant restrictions in:

• employment;
• self-care;
• community participation.

The impairment is similar.

The occupational impact is different.

Activity Limitations: Difficulty Performing Tasks

Activity limitations occur when a person experiences difficulty completing specific activities.

Examples may include difficulty with:

• dressing;
• preparing meals;
• travelling independently;
• communicating;
• managing routines;
• navigating community environments.

However, occupational therapists must consider the context of these difficulties.

A person may experience difficulty with an activity but still find meaningful ways to participate.

For example:

A person may have difficulty remembering medication.

An assistance animal may not necessarily be the most appropriate intervention.

Other strategies may include:

• environmental prompts;
• technology;
• routines;
• medication management systems.

The occupational therapist considers the most appropriate solution rather than assuming an animal is required.

Participation Restrictions: The Occupational Impact

Participation restrictions occur when a person is limited in involvement in meaningful life situations.

This is often where assistance animal assessment becomes most relevant.

Examples may include difficulty participating in:

• education;
• employment;
• relationships;
• community activities;
• recreation;
• independent living.

The occupational therapist must understand what participation means to the individual.

For example:

A person may experience difficulty entering crowded environments.

The important issue is not simply that the environment is challenging.

The important questions are:

• What occupations are affected?
• Why does participation matter?
• What outcomes does the person want?
• Could an assistance animal meaningfully address the barrier?

The Difference Between Activity and Occupation

A key occupational therapy principle is that activities become meaningful through occupation.

An activity is something a person does.

An occupation is something meaningful that forms part of a person’s life.

For example:

A dog retrieving an object is an activity.

However, if that retrieval allows a person to:

• prepare breakfast independently;
• complete work tasks;
• participate safely in daily routines;

then it supports meaningful occupation.

The occupational therapist therefore avoids focusing only on whether an animal can perform a behaviour.

The focus is whether the behaviour supports participation.

Why Assistance Animal Assessment Must Focus on Participation

Assistance animals are frequently associated with specific tasks.

However, the presence of a trained task does not automatically demonstrate meaningful benefit.

A task must be considered in relation to:

• the person’s goals;
• their environment;
• their occupations;
• their functional barriers.

For example:

A dog may be trained to interrupt a behaviour.

The occupational question is not:

“Can the dog interrupt the behaviour?”

The question is:

“Does this intervention improve the person’s ability to engage in meaningful occupations?”

Functional Impact Is Individual

Functional impact varies significantly between individuals.

The same diagnosis may result in:

• different activity limitations;
• different participation restrictions;
• different support needs.

For example:

Two people with anxiety-related disability may have very different experiences.

Person A may experience difficulty leaving home but have effective strategies and strong support networks.

Person B may experience barriers that significantly affect:

• employment;
• education;
• relationships;
• community participation.

The occupational therapist must assess the individual situation rather than applying diagnosis-based assumptions.

The Role of Context in Functional Assessment

Functional performance cannot be understood separately from the environment.

A person’s ability to participate is influenced by:

• physical environment;
• social environment;
• accessibility;
• available supports;
• expectations of others.

For example:

A person may appear independent during a clinic assessment but experience significant barriers in their home, workplace or community environment.

This is why occupational therapists often need to assess function within real-life contexts.

Functional Assessment Before Assistance Animal Recommendation

Before recommending an assistance animal, the occupational therapist should identify:

• the occupational problem;
• the functional barrier;
• current strategies;
• environmental factors;
• desired outcomes;
• possible interventions.

The question is not:

“What task should the animal perform?”

The question is:

“What occupational barrier exists, and what intervention is most appropriate to address it?”

Only after this reasoning occurs should potential assistance animal roles be considered.

Examples of Functional Reasoning

Example 1: Mobility

Diagnosis-based thinking:

“The person has a mobility impairment, therefore they need an assistance dog.”

Functional reasoning:

“The person experiences difficulty completing specific occupations due to mobility barriers. Assessment explores whether an assistance animal could address those barriers compared with other assistive options.”

Example 2: Autism

Diagnosis-based thinking:

“The person is autistic, therefore they require an assistance animal.”

Functional reasoning:

“The person experiences specific participation barriers. Assessment considers whether an assistance animal could meaningfully support identified goals alongside other interventions.”

Example 3: Mental Health

Diagnosis-based thinking:

“The person has PTSD, therefore they require an assistance animal.”

Functional reasoning:

“The person experiences occupational restrictions affecting meaningful participation. Assessment explores whether an assistance animal is an appropriate and sustainable support.”

Implications for Occupational Therapy Practice

Occupational therapists should:

• distinguish diagnosis from functional impact;
• assess participation rather than impairment alone;
• identify meaningful occupational goals;
• consider environmental influences;
• evaluate whether an assistance animal is the appropriate intervention.

Functional assessment provides the foundation for ethical assistance animal recommendations.

Key Practice Principles

1. Diagnosis Does Not Explain Occupational Need

A health condition provides context but does not determine intervention.

2. Functional Impact Determines Relevance

Assistance animals should address identified participation barriers.

3. Participation Is the Ultimate Outcome

Tasks are valuable because they support meaningful occupations.

4. Assessment Must Consider Context

Function is shaped by the person, environment and situation.

5. Impairment Does Not Equal Disability

Disability emerges through the interaction between the person and their environment.

6. Start With the Occupational Problem, Not the Animal Solution

Clinical reasoning should identify the need before considering the intervention.

Understanding the difference between diagnosis, impairment, activity and participation allows occupational therapists to move beyond labels and focus on the real-world impact of disability. Within assistance animal practice, this ensures recommendations are based on meaningful occupational needs rather than assumptions about diagnoses, resulting in more ethical, effective and sustainable partnerships.