Yesterday afternoon I found my dog’s right ear canal bleeding and discharging pus

A dog’s ear bleeding and discharging pus is very likely a symptom of suppurative otitis. Causes include bacterial, fungal, and parasitic infections, as well as tumors; treatment differs by cause, so the specific diagnosis must be confirmed. The owner should first take the dog to the vet to avoid improper treatment that worsens the condition.

At home, consider an ear-cleaning solution plus antibacterial ear drops to relieve it, and use an Elizabethan collar during treatment. Normally keep the ears from getting water and pluck ear hair regularly to keep the canal ventilated and dry, preventing recurrence.