"The doll." She held up the rubber toy. "Since this trouble started Lucy has become devoted to her."

"I see. And what trouble is that?"

"Well, it's been going on for about two weeks now.

She's so listless and strange, and she hardly eats anything."

I reached behind me to the trolley for the thermometer. "Right, we'll have a look at her. There's something wrong when a dog won't eat."

The temperature was normal. I went over her chest thoroughly with my stethoscope without finding any unusual sounds. The heart thudded steadily in my ears. Careful palpation of the abdomen revealed nothing out of the way.

The lady stroked Lucy's curly poll and the little animal looked up at her with sorrowful liquid eyes. "I'm getting really worried about her. She doesn't want to go for walks. In fact we can't even entice her from the house without Emmeline."

"Eh?"

"I say she won't take a step outside unless we squeak Emmeline at her, and then they both go out together. Even then she just trails along like an old dog, and she's only three after all. You know how lively she is normally."

I nodded. I did know. This little poodle was a bundle of energy. I had seen her racing around the fields down by the river, jumping to enormous heights as she chased a ball. She must be suffering from something pretty severe, but so far I was baffled.

And I wished the lady wouldn't keep on about Emmeline and the squeaking. I shot a side glance at David. I had been holding forth to him, telling him how ours was a scientific profession and that he would have to be really hot at physics, chemistry and biology to gain entrance to a veterinary school, and it didn't fit in with all this.

Maybe I could guide the conversation along more clinical lines.

"Any more symptoms?" I asked. "Any cough, constipation, diarrhoea? Does she ever cry out in pain?"

The lady shook her head. "No. Nothing like that. She just looks around looking at us with such a pitiful expression and searching for Emmeline."

Oh dear, there it was again. I cleared my throat. "She never vomits at all? Especially after a meal?"

"Never. When she does eat a little she goes straight away to find Emmeline and takes her to her basket."

"Really? Well I can't see that that has anything to do with it. Are you sure she isn't lame at times?"

The lady didn't seem to be listening. "And when she gets Emmeline into her basket she sort of circles around, scratching the blanket as though she was making a bed for the little thing."

I gritted my teeth. Would she never stop? Then a light flashed in the darkness.

"Wait a minute," I said. "Did you say making a bed?"

"Yes, she scratches around for ages then puts Emmeline down."

"Ah yes." The next question would settle it. "When was she last in season?"

The lady tapped a finger against her cheek. "Let me see. It was in the middle of May-that would be about nine weeks ago."

There wasn't a mystery any more.

"Roll her over, please," I said.

With Lucy stretched on her back, her eyes regarding the surgery ceiling with deep emotion, I ran my fingers over the mammary glands. They were turgid and swollen. I gently squeezed one of the teats and a bead of milk appeared.

"She's got false pregnancy," I said.

"What on earth is that?" The lady looked at me, round-eyed.

"Oh, it's quite common in bitches. They get the idea they are going to have pups and around the end of the gestation period they start this business. Making a bed for the pups is typical, but some of them actually swell in the abdomen. They do all sorts of peculiar things."

"My goodness, how extraordinary!" The lady began to laugh. "Lucy, you silly little thing, worrying us over nothing." She looked at me across the table. "How long is she going to be like this?"

I turned on the hot tap and began to wash my hands. "Not for long. I'll give you some tablets for her. If she's not much better in a week come back for more. But you needn't worry-even if it takes a bit longer she'll be her old self in the end."

I went through to the dispensary, put the tablets in a box and handed them over. The lady thanked me then turned to her pet who was sitting on the tiled floor looking dreamily into space.

"Come along Lucy," she said, but the poodle took no notice. "Lucy! Do you hear me? We're going now!" She began to walk briskly along the passage but the little animal merely put her head on one side and appeared to be hearkening to inward music. After a minute her mistress reappeared and regarded her with some exasperation. "Oh really, you are naughty. I suppose there's only one way." She opened her handbag and produced the rubber toy.

"Squeak-squeak," went Emmeline and the poodle raised her eyes with misty adoration. "Squeak-squeak, squeak-squeak." The sound retreated along the passage and Lucy followed entranced until she disappeared round the corner.

I turned to David with an apologetic grin. "Right," I said. "We'll get out on the road. I know you want to see farm practice and I assure you it's vastly different from what you've seen here."

Sitting in the car, I continued. "Mind you, don't get me wrong. I'm not decrying small animal work. In fact I'd have to admit that it is the most highly skilled branch of the profession and I personally think that small animal surgery is tremendously demanding. Just don't judge it all by Emmeline. Anyway, we have one doggy visit before we go out into the country."

"What's that?" the lad asked.

"Well, I've had a call from a Mr. Rington to say that his dalmatian bitch has completely altered her behaviour. In fact she's acting so strangely that he doesn't want to bring her to the surgery."

"What do you think that might be?"

I thought for a moment. "It seems a bit silly, but the first thing that comes to my mind is rabies. This is the most dreadful dog disease of all, but thank heaven we've managed to keep it out of this country so far by strict quarantine regulations. But at college it was hammered into us so forcibly that it is always at the back of my mind even though I don't really expect to see it. But this case of the dalmatian could be anything. I only hope she hasn't turned savage because that's the sort of thing that leads to a dog being put down and I hate that."

Mr. Rington's opening remark didn't cheer me.

"Tessa's become really fierce lately, Mr. Herriot. Started moping about and growling a few days ago and frankly I daren't trust her with strangers now. She nailed the postman by the ankle this morning. Most embarrassing."

My spirits sank lower. "Actually bit somebody!" Mr. Rington went on. "It's unbelievable-she's such a softie. I've always been able to do anything with her."

"I know, I know," he muttered. "She's marvellous with children, too. I can't understand it. But come and have a look at her."

The dalmatian was sitting in a corner of the lounge and she glanced up sulkily as we entered. She was a favourite patient and I approached her confidently.

"Hello, Tessa," I said, and held out my hand. I usually had a tail-lashing, tongue-lolling welcome from this animal but today she froze into complete immobility and her lips withdrew silently from her teeth. It wasn't an ordinary snarl-it was as though the upper lip was operated by strings and there was something unnerving about it.

"What's the matter, old girl?" I enquired, and again the gleaming incisors were soundlessly exposed. And as I stared uncomprehendingly I could see that the eyes were glaring at me with blazing primitive hatred. Tessa was unrecognizable.

"Mr. Herriot." Her owner looked at me apprehensively. "I don't think I'd go any nearer if I were you."

I withdrew a pace. "Yes, I'm inclined to agree with you. I don't think she'd cooperate if I tried to examine her. But never mind, tell me all about her."

"Well, there's really nothing more to tell," Mr. Kington said helplessly. "She's just different-like this."

"Appetite good?"

"Yes, fine. Eats everything in front of her."

"No unusual symptoms at all?"

"None, apart from the altered temperament. The family can handle her, but quite frankly I think she'd bite any stranger who came too near."

I ran my fingers through my hair. "Any change in family circumstances? New baby? Different domestic help? Unusual people coming to the house?"

"No, nothing like that. There's been no change."

"I ask because animals sometimes act like this put of jealousy or disapproval."

"Sorry." Mr. Rington shrugged his shoulders. "Everything is just as it's always been. Only this morning my wife was wondering if Tessa was still cross with us because we kept her indoors for three weeks while she was in season. But that was a long time ago-about two months now."

I whipped round and faced him. "Two months?"

"Yes, about that."

Surely not again! I gestured to the owner. "Would you please lift her up so that she's standing on her hind legs?"

"Like this?" He put his arms round the dalmatian's chest and hoisted till she was in the upright position with her abdomen facing me.

And it was as if I knew beforehand. Because I felt not the slightest surprise when I saw the twin row of engorged teats. It was unnecessary, but I leaned forward, grasped a little nipple and sent a white jet spurting.

"She's bulging with milk," I said.

"Milk?"

"Yes, she's got false pregnancy. This is one of the more unusual side effects, but I'll give you some tablets and she'll soon be the docile Tessa again."

As we got back into the car I had a good idea what the schoolboy was thinking. He would be wondering where the chemistry, physics and biology came in.

"Sorry about that, David," I said. "I've been telling you all about the constant variety of a vet's life and the first two cases you see are the same condition. But we are going out to the farms now and as I said, you'll find it very different. I mean, those two cases were really psychological things. You don't get that in country practice. It's a bit rough but it's real and down to earth."

As we drove into the farmyard I saw the farmer carrying a bag of meal over the cobbles.

I got out of the car with David. "You've got a pig ill, Mr. Fisher?"

"Aye, a big sow. She's in 'ere." He led the way into a pen and pointed to a huge white pig lying on her side.

"She's been off it for a few days," he said. "Hardly eats owt-just picks at her food. And she just lays there all t'time. Ah don't think she's got strength to get to her feet."

My thermometer had been in the pig's rectum as he spoke and I fished it out and read the temperature. It was 102.2-dead normal. I auscultated the chest and palpated the abdomen with growing puzzlement. Nothing wrong. I looked over at the trough nearby. It was filled to the brim with fresh meal and water-untouched. And pigs do love their food.

I nudged her thigh with my fist. "Come on, lass, get up." And I followed it with a brisk slap across the rump. A healthy pig would have leaped to her feet but the sow never moved.

I tried not to scratch my head. There was something very funny here. "Has she ever been ill before, Mr. Fisher?"

"Nay, never ailed a thing and she's allus been a real lively pig, too. Ah can't reckon it up."

Nor could I. "What beats me," I said, "is that she doesn't look like a sick animal. She's not trembling or anxious, she's lying there as if she hadn't a care in the world."

"Aye, you're right, Mr. Herriot. She's as 'appy as Larry, but she'll neither move nor eat. It's a rum 'un, isn't it?"

It was very rum indeed. I squatted on my heels, watching the big sow. She reached forward and pushed gently with her snout at the straw bedding round her head. Sick pigs never did that. It was a gesture of well-being. And those little grunts which issued from deep in her chest. They were grunts of deep contentment and there was something familiar about the sound of them ... something lurking at the back of my mind which wouldn't come forward. It was the same with the way the sow eased herself further on to her side, pushing the great stretch of abdomen outward as though in offering.

I had heard and seen it so many times before-the happy sounds, the careful movements. Then I remembered. Of course! She was like a sow with a litter, only there was no litter.

A wave of disbelief flowed over me. Oh no, no, please not a third time! It was dark in the pen and I couldn't get a clear view of the mammary glands.

I turned to the farmer. "Open the door a little, will you, please."

As the sunshine flooded in everything was obvious. It was mere routine to reach out to the long tumefied udder and squirt the milk against the wall.

I straightened up wearily and was about to make my now commonplace announcement when David did it for me.

"False pregnancy?" he said.

I nodded dumbly.

"What was that?" enquired Mr. Fisher., "Well your sow has got it into her head that she is pregnant," I said. "Not only that, but she thinks she has given birth to a litter and she's suckling the imaginary piglets now. You can see it, can't you?"

The farmer gave a long soft whistle. "Aye ... aye ... you're right. That's what she's doin' ... enjoyin' it, too." He took off his cap, rubbed the top of his head and put the cap on again. "Well, there's allus summat new, isn't there?"

It wasn't new to David, of course. Old stuff, in fact, and I didn't want to bore him further with a lengthy dissertation.

"Nothing to worry about, Mr. Fisher," I said hastily. "Call down to the surgery and I'll give you something to put in her food. She'll soon be back to normal."

As I left the pen the sow gave a deep sigh of utter fulfillment and moved her position with the utmost care to avoid crushing her phantom family. I looked back at her and I could almost see the long pink row of piglets sucking busily. I shook my head to dispel the vision and went out to the car.

I was opening the door when the farmer's wife trotted towards me. "I've just had a phone call from your surgery, Mr. Herriot. They want you to go to Mr. Rogers of East Farm. There's a cow calving."

An emergency like this in the middle of a round was usually an irritant, but today the news came as a relief. I had promised this schoolboy some genuine-country practice and I was beginning to feel embarrassed.

"Well, David," I said with a light laugh as we drove away. "You must be thinking all my patients are neurotic. But you're going to see a bit of the real thing now-there's nothing airy-fairy about a calving cow. This is where the hard work of our job comes in. It's often pretty tough fighting against a big straining cow, because you must remember the vet only sees the difficult cases. Where the calf is laid wrong."

The situation of East Farm seemed to add weight to my words. We were bumping up the fellside along a narrow track which was never meant for motor cars and I winced as the exhaust grated against the jutting rocks.

The farm was perched almost on the edge of the hilltop and behind it the sparse fields, stolen from the moorland, rolled away to the skyline. The crumbling stonework and broken roof tiles testified to the age of the squat grey house.

I pointed to some figures, faintly visible on the massive stone lintel above the front door. "What does that date mean to you, David?"

"Sixteen sixty-six, the great fire of London," he replied promptly.

"Well done. Strange to think they were building this place in the same year as old London burned down."

Mr. Rogers appeared, carrying a steaming bucket and a towel. "She's out in t'field, Mr. Herriot, but she's a quiet cow and easy to catch."