How to get a 13 year old Westie in shape (diet, exercise, etc)?

Our westie turns 13 in March, and he's a little bit overweight. Other than being tubby, he's in good health (no developing conditions as far as we know, but we'll take him to the vets again in a couple of months for a check up). He's generally very energetic (although because he's getting... show more Our westie turns 13 in March, and he's a little bit overweight. Other than being tubby, he's in good health (no developing conditions as far as we know, but we'll take him to the vets again in a couple of months for a check up).

He's generally very energetic (although because he's getting older and has more weight, he gets tired easier, but he loves running around the house/zoomies, playing fetch like a mad man, etc), and we've gotten a bit more lax on his snacks/treats over the past few years so that won't have helped.

Currently, we only walk him a few times a week - mainly because we live in the UK and it rains about 4/7 days a week, and he can't stand being out in the rain (he hates water lmao), and when we do walk him, he runs/jogs and barks constantly for the first 5-10 minutes and then by the time we've been out for 20 minutes, we literally have to drag him home he's walking that slowly.
Usually taking him out once a day will knock him out for the rest of the day (lol) so we can't really take him out in short bursts a few times a day yet.

We also keep a small bowl of biscuits out all day (he doesn't eat biscuits all at once, he'll have a few every hour or so), and at 6pm he'll have 1/4 a can of tripe (or any other meat we have left over, just for a change).

He has a dental stick chew every night at 9pm (mainly for his gums and as a snack) and we've been trying to cut out giving him any human food in between meals.

Anything else we can do? Any ideas?
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