As every owner of a smaller dog knows, being a “big dog” is all about attitude, not size (Letters, 20 January ). Ian Grieve Gordon Bennett, Llangollen Canal Joyce Turcotte praises masks for covering up wrinkles (Letters, 16 January ), but I find them useful for covering up my yawning in face-to-face meetings. Tim Martineau WirralHelp your pet be as active as nature intended. Exercise and play time are necessary for your pet’s mental and physical well-being. If you don’t give your dog opportunities to be physically active, or if you don’t encourage exercise for your kitty and find ways to make it happen, you may well end up with a bored, destructive, overweight pet whose health will spiral downward throughout her lifetime.