Dog Urine Damage on Young Spruce

Why It Happens

Urine contains high salts (urea, sodium) that desiccate foliage and kill cambium. On a week-old transplant with limited roots, even one episode can cause brown patches or death.

Prevention

• Apply commercial dog repellent (capsaicin-based) to lower trunk and mulch.
• Install a physical barrier (wire cage, decorative fence) until the tree is established.
• Train the dog to a designated area away from plantings.

Recovery

Water deeply to flush salts. Do not fertilize. Monitor for new growth. If the cambium is killed on one side, that sector of the canopy may die back.