There's no direct evidence linking CBD oil to constipation in dogs.

However, excessive doses might lead to appetite changes or diarrhea in pets. Dogs have a unique endocannabinoid system like humans, and introducing cannabinoids can produce different responses. The popularity of CBD oil for pets, especially dogs, has surged in recent years, with the best CBD oil for dogs offering potential relief from anxiety, pain, and various other conditions. 

One common concern that pet owners might face when administering CBD oil to their dogs is the potential for side effects.

Overdosing or giving excessive amounts of CBD oil might not directly lead to constipation, but it can cause other digestive issues. Appetite changes are a potential consequence, with some dogs experiencing an increase or decrease in their usual food intake. Diarrhea is another possible side effect, indicating that the pet's digestive system might be reacting to the CBD oil.

To avoid these unpleasant experiences, choose products that have been third-party tested. This ensures the purity of the CBD and confirms that harmful elements, such as pesticides or heavy metals, are absent.

While sharing your CBD stash with your furry friend might be tempting, it's not recommended. Dogs have different metabolic rates and body structures, meaning they process substances differently. Many CBD products for humans might contain additives or concentrations unsuitable for pets.

Therefore, it's best if you stick to CBD oil or dogs with arthritis instead of using human-grade CBD oil.