Review finds promise, but thin evidence, for AATx in SCI rehab
Bottom line
A new scoping review in Spinal Cord maps what’s actually been studied on animal-assisted treatment in spinal cord injury rehabilitation, and the evidence base is still small. The review identified 10 studies published from 2003 to 2020, covering 107 intervention participants across canine- and equine-assisted approaches. Canine-assisted interventions were linked to lower upper-limb muscular effort during wheelchair propulsion, faster task completion, and, in one randomized trial, lower negative affect and pain unpleasantness. Equine-assisted interventions were most often associated with short-term reductions in spasticity, with mixed findings on balance and gait. But the authors stress that the literature is methodologically limited: just one randomized controlled trial was included, three studies were case reports, and outcomes, patient populations, and intervention designs were highly heterogeneous. (nature.com)
Why it matters: For veterinary professionals working with rehabilitation teams, therapy animal programs, or One Health initiatives, the review is a useful reality check. It suggests there may be clinically relevant benefits for some patients, especially around motivation, spasticity, wheelchair mobility, and affect, but the evidence isn’t yet strong enough to support broad claims of efficacy. That matters because implementation in rehab settings also brings practical questions around infection control, handler training, documentation, cost, and animal welfare, all of which have been flagged in broader hospital rehabilitation literature. The SCI review itself also notes that animal welfare reporting was sparse, with only one included study explicitly stating that sessions would stop if dogs showed stress. A newly published systematic review on physiological co-modulation during human-animal interaction adds another layer: across 37 dog- and horse-focused studies, evidence for synchronized physiological responses between people and animals was significant or partial in most studies, but findings were highly context- and method-dependent, and far from conclusive. (nature.com)
What to watch: The next step is whether researchers can move from small, short-term studies to better-controlled trials that compare animal-assisted treatment with standard care and explicitly track dose, durability of benefit, and animal welfare outcomes. The co-modulation review also suggests a more specific opportunity: pairing clinical outcomes with simultaneous human-animal physiological measures may help clarify when these interventions are helping patients without overtaxing the animals involved.
Key facts
- Study type
- Scoping review
- Journal
- Spinal Cord
- Topic
- Animal-assisted treatment in spinal cord injury rehabilitation
- Studies included
- 10
- Publication years
- 2003 to 2020
- Intervention participants
- 107
- Approaches studied
- Canine-assisted and equine-assisted
- Main limitation
- Evidence base was small, heterogeneous, and methodologically limited
- Randomized controlled trials included
- 1
Animal-assisted treatment is getting a closer look in spinal cord injury rehabilitation, but a new scoping review suggests the field is still early and uneven. Writing in Spinal Cord, researchers identified 10 empirical studies on animal-assisted treatment in adults with spinal cord injury, spanning canine-assisted and equine-assisted interventions. Across those studies, signals of benefit appeared in areas such as spasticity, wheelchair propulsion, task speed, motivation, and well-being, but the evidence base was too limited and heterogeneous to support firm clinical conclusions. (nature.com)
The review arrives as terminology and standards in the field continue to evolve. The authors frame animal-assisted treatment, or AATx, using recent IAHAIO guidance that emphasizes structured, goal-oriented care delivered by qualified professionals, rather than informal animal visits. That distinction matters because animal-assisted services have often suffered from inconsistent definitions, mixed methodologies, and uneven reporting, a problem also highlighted in earlier umbrella and systematic reviews of animal-assisted interventions. A separate scoping review of adult hospital rehabilitation settings similarly described the field as emerging, with limited standardization and recurring implementation challenges. (nature.com)
In the SCI-specific review, the authors screened 257 unique records and ultimately included 10 studies. Those studies were published between 2003 and 2020 and included three case studies, three quasi-experimental studies, two non-controlled pre-post studies, one cross-over trial, and one randomized controlled trial. Participant numbers ranged from 1 to 32, and injury characteristics varied widely, from sub-acute to chronic SCI and from complete to incomplete injuries. That variability makes it difficult to compare interventions directly or identify which patients might benefit most. (nature.com)
The canine-assisted studies largely focused on mobility assistance dogs and occupational therapy contexts. Across three studies, upper-limb muscular activity decreased during wheelchair-related tasks, including reductions in biceps, triceps, anterior deltoid, and pectoralis major activity. Two studies also found lower pushrim forces, and three reported faster wheelchair propulsion or course completion. In the lone randomized trial, combining animal-assisted treatment with occupational therapy significantly reduced negative affect over two sessions and reduced pain unpleasantness across four sessions, though it did not significantly change positive affect, pain severity, pain interference, or salivary cortisol. (nature.com)
The equine-assisted studies pointed in a somewhat different direction. Three of five studies linked hippotherapy or therapeutic horseback riding with reduced spasticity, including one cross-over trial in which hippotherapy outperformed active comparator conditions for self-rated spasticity. Some participants also reported gains in confidence, social engagement, posture, balance, and motivation. Still, not all findings were positive or durable: one pilot study found no significant change in standing balance or stability overall, gait findings were mixed, and some benefits appeared to fade within days. (nature.com)
Outside the SCI literature, broader reviews offer both encouragement and caution. A 2023 systematic review on neurological diseases concluded that animal-assisted interventions may support rehabilitation goals, but emphasized the need for stronger evidence. A separate systematic review on physiological co-modulation during human-animal interaction adds a useful mechanistic angle: across 37 studies involving dogs and horses, simultaneous physiological measures in both species showed significant co-modulation in 16 studies, partial co-modulation in 16, and no evidence in 5. Cardiac and hormonal signals were the most commonly studied, and time-series coupling methods appeared to produce more consistent evidence than simple correlation analyses. The authors concluded that physiological synchrony may occur during human-animal interaction, but likely under specific biological and methodological conditions rather than as a universal effect. Another scoping review of adult hospital rehabilitation settings found reported improvements in social and emotional well-being, ambulation, motor skills, and communication, while also highlighting operational barriers such as reliance on volunteer dog-handler teams, documentation gaps, infection-control requirements, cost, and animal welfare concerns. Those issues are directly relevant for veterinary teams involved in therapy animal health screening, welfare monitoring, and program design.
Why it matters: For veterinary professionals, the review reinforces that therapy-animal work in human rehabilitation sits at the intersection of clinical promise and evidence gaps. The potential benefits for patients may be real, but safe expansion will depend on more than patient-reported enthusiasm. Veterinary input is central to screening animals for suitability, monitoring stress and fatigue, supporting infection-control protocols, and helping programs document welfare outcomes that are often missing from published studies. The authors explicitly call for future trials to report animal welfare outcomes, and broader guidance in the field is moving in the same direction, with IAHAIO’s updated materials increasingly framing animal-assisted services through both professional standards and animal well-being. The co-modulation literature strengthens the case for that dual focus: if human and animal physiology can become linked during interaction in some settings, then welfare monitoring is not just an ethical add-on but part of understanding how these interventions work and when they may place demands on the animal partner. (nature.com)
What to watch: Expect the next phase of research to focus on higher-quality randomized or single-case experimental designs, standard-care comparators, repeated follow-up measures, and better reporting on dose, injury subtype, and animal welfare, which will determine whether animal-assisted treatment becomes a more credible part of SCI rehabilitation rather than a promising but niche adjunct. A logical next step will be studies that pair patient outcomes with simultaneous human-animal physiological monitoring, which could help clarify both mechanism and welfare in real rehabilitation settings.