When selecting dog toys, avoid materials that are easily breakable or pose choking hazards, such as soft plush toys with squeakers or stuffing. These can be dangerous if swallowed, causing blockages or injuries. Rope and tug toys should be skipped for dogs with aggressive tendencies, as they can become overly excited and risk injury. Additionally, toys made of weak or easily destructible plastic should be avoided for larger breeds that may chew through them quickly, potentially ingesting harmful pieces. Always prioritize durable, non-toxic materials to ensure safety.