In recent decades, the prevalence of allergic diseases, particularly respiratory allergies, has risen significantly. In childhood, house dust mites are the primary indoor allergen in infancy, while the prevalence of pollen sensitization increases with age. As one of the largest immunologic organs, the skin frequently displays allergic responses; therefore, the Skin Prick Test (SPT) is widely used for diagnostic purposes. SPT is quick, cost-effective, highly sensitive, and rarely causes adverse effects, yet it may still induce stress or anxiety in children-especially younger ones or when applied on the back.

Although distraction methods (e.g., toys, games, DistrACTION® Cards) are commonly used to reduce discomfort in minimally invasive pediatric procedures, there is limited research on strategies to alleviate stress during SPT. This randomized controlled trial (RCT) aims to investigate the impact of pet therapy using betta fish on children's emotional symptoms (such as anger or irritability) and physiological parameters during SPT. The study will include 80 children, aged 3-6, who attend a pediatric allergy clinic between April 2025 and April 2026. Participants will be randomly assigned to control or experimental groups through simple and block randomization, ensuring age balance. Data collection instruments include a Personal Information Form, the Children's Emotional Indicator Scale, FLACC Pain Scale, and a Physiological Parameter Monitoring Form.

The study posits two main hypotheses:

Pet therapy positively affects emotional indicators of children based on their age.

Pet therapy influences physiological parameters by age group. Findings from this research may inform evidence-based interventions to reduce stress and anxiety in pediatric patients undergoing minimally invasive procedures like SPT.

In recent years, there has been a marked increase in the prevalence of allergic diseases. In particular, the incidence of allergic respiratory diseases has almost doubled in the last two decades. This increase is thought to be related to increased sensitization to both indoor and outdoor allergens. Indoors, house dust mites remain the most important cause of allergic sensitization in infants. With increasing age, the prevalence of aeroallergens, especially pollen, increases and sensitization to indoor and outdoor allergens reaches similar levels around three years of age. Sensitization to both allergen groups also increases during childhood. In addition to aeroallergens, there is also immune sensitization to foodborne and drug allergens. The skin is one of the largest immunologic organs, the most frequent target of allergic responses and responds to a wide range of allergic agents. Skin prick test (SPT) is a sensitive method to investigate these allergic disorders. When antigen combines with immunoglobulin E (IgE) antibodies fixed to mast cells, chemical mediators are released from mast cells within five minutes, resulting in the formation of a wheal. SPT is a rapid, simple, low-cost, easy-to-apply and highly sensitive diagnostic method to assess environmental allergy sensitization. This method has high sensitivity and positive predictive ability. Compared with the specific IgE blood test, the accuracy of the test is over 95% and side effects are very rare. SPT can generally be performed without discomfort and a large proportion of patients can tolerate this test without distress. However, the nature of the procedure may cause stress and anxiety, especially in children. Minimally invasive procedures such as venipuncture, dental treatment and routine vaccinations may cause discomfort in children and distraction methods are used in these cases. There is limited information on the effects of SPT on pain and anxiety in children. Existing studies have generally focused on fear and anxiety. Karaatmaca et al. (2021) found that mothers had higher pre-test and post-test STAI anxiety scores than fathers and that parental gender had a significant effect on anxiety. In addition, SPT was found to cause anxiety and pain in some children, especially at young ages and when applied on the back. In a study by Erdim (2022), the use of DistrACTION® Cards to distract children aged 6-10 years during a skin puncture test was examined. In this study, it was found that the pain scores of children during and after the procedure were significantly lower compared to the control group and the use of DistrACTION Cards was effective in reducing the pain and anxiety levels of children. Since the emotional indicators of children have never been evaluated during allergy testing, which is a minimally invasive procedure, this study was planned as a randomized controlled trial to determine the effect of pet therapy application on emotional symptoms and physiological parameters according to age periods in children during allergy testing.

Hypotheses of the study; H1a: Pet therapy has an effect on pain and emotional indicators of children according to their age periods.

H1b: Pet therapy has an effect on the physiological parameters of the child according to age periods.

This study was planned as a randomized controlled trial to determine the effect of pet therapy application on emotional symptoms and physiological parameters according to age periods in children during allergy testing. It included children between the ages of 3-6 who applied to the pediatric allergy outpatient clinics of a training and research hospital between April 2025 and April 2026 and underwent allergy testing. The research sample will consist of children who applied to the pediatric allergy outpatient clinics on the specified dates, met the research criteria and volunteered to participate in the study. Dependent t test analysis was taken into consideration in sample size calculation. With a Type I error rate of 5%, effect size (ES) and moderate power (ES=0.25) of 99%, it was calculated that a total of at least 80 children, 40 children in each group, should be included in the study. In the study, "simple randomization and block randomization methods" will be used to assign participants to control and experimental groups. Numbers will be assigned to the experimental and control groups on www.randomizer.org and blocking will be done according to age to ensure balance between the groups. Personal Information Form, Children's Emotional Indicator Scale, FLACC Pain Scale and Physiological Parameter Monitoring Form will be used to collect the data. Betta fish will be used as the intervention tool in the study.

Inclusion Criteria:

• No previous allergy testing
• 3-6 years old
• Stable hemodynamics
• No chronic disease
• The child has no intellectual or neurological disability
• The mother has no obstacle to communication
• Mother is literate
• Families and children agree to participate in the study.

Exclusion Criteria:

• The child does not meet the inclusion criteria
• The mother does not meet the inclusion criteria
• Child's and mother's unwillingness to participate in the study

The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.