For most dogs, it is not the tumour which causes a change in your dog’s behaviour or appearance – but instead it is the increase in cortisol which has the biggest impact.
In very rare cases, pituitary tumours can expand to be greater than 1 cm in size. Although they are unlikely to invade the nearby tissue, they can push onto the brain. This has the potential to cause signs such as pacing, circling, and in extreme cases seizures and blindness. However, it is important to remember that such cases are very rare, and we would recommend discussing with your vet if you dog starts to display any of these signs.
If your dog is found to have a tumour within their adrenal gland, the incidence of a cancerous tumour is increased when compared to a pituitary tumour.