That time of year when trees go up and are decorated, unusual foods are about, and cats delight in gifting us with humungous vets bills. So a little round up of things to look out for. This is probably just a starter - I'm sure others will think of things I've forgotten to add.
There are many plants toxic to cats, Poinsettias being the first to come to mind this time of hear. Mistletoe is poisonous, and holly berries aren't too good for cats either. All lillies are bad for them, and remember it isn't just eating them but if they get the pollen in their fur they will lick it off.
Some human food is bad for them as well, especially things like chocolate, dried fruit (raisins, sultanas), onions and garlic. It's one thing when the cat steals your XMas dinner, but if it has stuffing like sage & onion in it's bad for the cat as well. Cooked bird bones can splinter & puncture their innards (same with dogs) and need to be kept out of reach.
We (mostly) love shiny decorations about the house, but not only is it disconcerting to see silvery threads linking cat poo like sausages, but it can twist in the gut and cause a blockage.
Trees have lots of potential dangers. Firstly lights, very chewable wires which can set the tree (and even possible your house) on fire. Baubles are irresistible to some cats who will bat them about so keep any glass ones high up as they tend to shatter into tiny sharp fragments. Pine needles can get stuck in feet too if you have a real tree. As many cats adore climbing up trees & hiding in the branches, a solid base is a must and attaching the tree near the top to a wall or the ceiling is advisable. Don't try what a friend did one year and get an inflatable tree - cats claws can puncture them!
Even outside there are hazards particular to this time of year. Look out for neighbours who are topping up their anti freeze, cats love drinking from grungy puddles & anti freeze can be deadly.