1. American Pet Products Association (APPA). 2023. Latest Pet Ownership and Spending Data from APPA Reveals Continued Strength of National Pet Industry in the Face of Economic Uncertainty. https://www.americanpetproducts.org/press_releasedetail.asp?id=1267
2. Manifestations of chronic and acute stress in dogs
3. Indicators of stress and stress assessment in dogs;Bodnariu ALINA;Lucr Stiint Med Vet,2008
4. Rachel Casey. 2002. Fear and stress. BSAVA manual of canine and feline behavioural medicine (2002), 144–153.
5. CleverPet. 2020. Exercise you pet’s mind and body. Retrieved Aug 14, 2023 from https://clever.pet/